diff --git a/lib/libc_r/uthread/uthread_accept.c b/lib/libc_r/uthread/uthread_accept.c
index c703b8cf932d..9d1bcd8fc327 100644
--- a/lib/libc_r/uthread/uthread_accept.c
+++ b/lib/libc_r/uthread/uthread_accept.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 int
-accept(int fd, struct sockaddr * name, socklen_t *namelen)
+_libc_accept(int fd, struct sockaddr * name, socklen_t *namelen)
 {
 	int             ret;
 
@@ -106,4 +106,6 @@ accept(int fd, struct sockaddr * name, socklen_t *namelen)
 	/* Return the socket file descriptor or -1 on error: */
 	return (ret);
 }
+
+__weak_reference(_libc_accept, accept);
 #endif
diff --git a/lib/libc_r/uthread/uthread_attr_setdetachstate.c b/lib/libc_r/uthread/uthread_attr_setdetachstate.c
index 36a846a34abf..6be3e4ee73b3 100644
--- a/lib/libc_r/uthread/uthread_attr_setdetachstate.c
+++ b/lib/libc_r/uthread/uthread_attr_setdetachstate.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
+int
+pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
 {
 	int	ret;
 
diff --git a/lib/libc_r/uthread/uthread_attr_setprio.c b/lib/libc_r/uthread/uthread_attr_setprio.c
index 4bd6b6699874..98ed0298354d 100644
--- a/lib/libc_r/uthread/uthread_attr_setprio.c
+++ b/lib/libc_r/uthread/uthread_attr_setprio.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setprio(pthread_attr_t *attr, int priority)
+int
+pthread_attr_setprio(pthread_attr_t *attr, int priority)
 {
 	int	ret;
 	if (attr == NULL || *attr == NULL) {
diff --git a/lib/libc_r/uthread/uthread_attr_setstackaddr.c b/lib/libc_r/uthread/uthread_attr_setstackaddr.c
index 7eb8c5d1319c..46469e4faf87 100644
--- a/lib/libc_r/uthread/uthread_attr_setstackaddr.c
+++ b/lib/libc_r/uthread/uthread_attr_setstackaddr.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
+int
+pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
 {
 	int	ret;
 
diff --git a/lib/libc_r/uthread/uthread_attr_setstacksize.c b/lib/libc_r/uthread/uthread_attr_setstacksize.c
index 2a2d85482e0a..3897811bb436 100644
--- a/lib/libc_r/uthread/uthread_attr_setstacksize.c
+++ b/lib/libc_r/uthread/uthread_attr_setstacksize.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
+int
+pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
 {
 	int	ret;
 
diff --git a/lib/libc_r/uthread/uthread_bind.c b/lib/libc_r/uthread/uthread_bind.c
index e6989a09e3b5..7cb3028cfd39 100644
--- a/lib/libc_r/uthread/uthread_bind.c
+++ b/lib/libc_r/uthread/uthread_bind.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-bind(int fd, const struct sockaddr * name, socklen_t namelen)
+_libc_bind(int fd, const struct sockaddr * name, socklen_t namelen)
 {
 	int             ret;
 
@@ -48,4 +48,6 @@ bind(int fd, const struct sockaddr * name, socklen_t namelen)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_bind, bind);
 #endif
diff --git a/lib/libc_r/uthread/uthread_close.c b/lib/libc_r/uthread/uthread_close.c
index 2580fcef02c5..fe2d9e2a4622 100644
--- a/lib/libc_r/uthread/uthread_close.c
+++ b/lib/libc_r/uthread/uthread_close.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 int
-close(int fd)
+_libc_close(int fd)
 {
 	int		flags;
 	int		ret;
@@ -102,4 +102,6 @@ close(int fd)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_close, close);
 #endif
diff --git a/lib/libc_r/uthread/uthread_connect.c b/lib/libc_r/uthread/uthread_connect.c
index 7c60f63ca771..03fea27b53cc 100644
--- a/lib/libc_r/uthread/uthread_connect.c
+++ b/lib/libc_r/uthread/uthread_connect.c
@@ -40,7 +40,7 @@
 #include "pthread_private.h"
 
 int
-connect(int fd, const struct sockaddr * name, socklen_t namelen)
+_libc_connect(int fd, const struct sockaddr * name, socklen_t namelen)
 {
 	struct sockaddr tmpname;
 	int             errnolen, ret, tmpnamelen;
@@ -75,4 +75,6 @@ connect(int fd, const struct sockaddr * name, socklen_t namelen)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_connect, connect);
 #endif
diff --git a/lib/libc_r/uthread/uthread_dup.c b/lib/libc_r/uthread/uthread_dup.c
index e32751a73dc0..63bd9bff8e7c 100644
--- a/lib/libc_r/uthread/uthread_dup.c
+++ b/lib/libc_r/uthread/uthread_dup.c
@@ -37,7 +37,7 @@
 #include "pthread_private.h"
 
 int
-dup(int fd)
+_libc_dup(int fd)
 {
 	int             ret;
 
@@ -67,4 +67,6 @@ dup(int fd)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_dup, dup);
 #endif
diff --git a/lib/libc_r/uthread/uthread_dup2.c b/lib/libc_r/uthread/uthread_dup2.c
index 2c9e9de6705b..b8b8a731a793 100644
--- a/lib/libc_r/uthread/uthread_dup2.c
+++ b/lib/libc_r/uthread/uthread_dup2.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-dup2(int fd, int newfd)
+_libc_dup2(int fd, int newfd)
 {
 	int             ret;
 	int		newfd_opened;
@@ -83,4 +83,6 @@ dup2(int fd, int newfd)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_dup2, dup2);
 #endif
diff --git a/lib/libc_r/uthread/uthread_execve.c b/lib/libc_r/uthread/uthread_execve.c
index 32b9e2ebdeb7..af42e39a7650 100644
--- a/lib/libc_r/uthread/uthread_execve.c
+++ b/lib/libc_r/uthread/uthread_execve.c
@@ -39,7 +39,7 @@
 #include "pthread_private.h"
 
 int 
-execve(const char *name, char *const * argv, char *const * envp)
+_libc_execve(const char *name, char *const * argv, char *const * envp)
 {
 	int		flags;
 	int             i;
@@ -110,4 +110,6 @@ execve(const char *name, char *const * argv, char *const * envp)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_execve, execve);
 #endif
diff --git a/lib/libc_r/uthread/uthread_exit.c b/lib/libc_r/uthread/uthread_exit.c
index abe4b278861d..57ac1141e251 100644
--- a/lib/libc_r/uthread/uthread_exit.c
+++ b/lib/libc_r/uthread/uthread_exit.c
@@ -41,7 +41,7 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-void _exit(int status)
+void _libc__exit(int status)
 {
 	int		flags;
 	int             i;
@@ -77,6 +77,8 @@ void _exit(int status)
 	_thread_sys__exit(status);
 }
 
+__weak_reference(_libc__exit, _exit);
+
 void
 _thread_exit(char *fname, int lineno, char *string)
 {
diff --git a/lib/libc_r/uthread/uthread_fchflags.c b/lib/libc_r/uthread/uthread_fchflags.c
index ec4e74748281..3334b56e8431 100644
--- a/lib/libc_r/uthread/uthread_fchflags.c
+++ b/lib/libc_r/uthread/uthread_fchflags.c
@@ -12,7 +12,7 @@
 #include "pthread_private.h"
 
 int
-fchflags(int fd, u_long flags)
+_libc_fchflags(int fd, u_long flags)
 {
 	int             ret;
 
@@ -22,4 +22,6 @@ fchflags(int fd, u_long flags)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_fchflags, fchflags);
 #endif
diff --git a/lib/libc_r/uthread/uthread_fchmod.c b/lib/libc_r/uthread/uthread_fchmod.c
index 536c4b86d275..1f8763798c47 100644
--- a/lib/libc_r/uthread/uthread_fchmod.c
+++ b/lib/libc_r/uthread/uthread_fchmod.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-fchmod(int fd, mode_t mode)
+_libc_fchmod(int fd, mode_t mode)
 {
 	int             ret;
 
@@ -48,4 +48,6 @@ fchmod(int fd, mode_t mode)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_fchmod, fchmod);
 #endif
diff --git a/lib/libc_r/uthread/uthread_fchown.c b/lib/libc_r/uthread/uthread_fchown.c
index 185fb257bc80..d49d7d165553 100644
--- a/lib/libc_r/uthread/uthread_fchown.c
+++ b/lib/libc_r/uthread/uthread_fchown.c
@@ -39,7 +39,7 @@
 #include "pthread_private.h"
 
 int
-fchown(int fd, uid_t owner, gid_t group)
+_libc_fchown(int fd, uid_t owner, gid_t group)
 {
 	int             ret;
 
@@ -49,4 +49,6 @@ fchown(int fd, uid_t owner, gid_t group)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_fchown, fchown);
 #endif
diff --git a/lib/libc_r/uthread/uthread_fcntl.c b/lib/libc_r/uthread/uthread_fcntl.c
index 878554cdbc1d..6cd2b12dd5cd 100644
--- a/lib/libc_r/uthread/uthread_fcntl.c
+++ b/lib/libc_r/uthread/uthread_fcntl.c
@@ -39,7 +39,7 @@
 #include "pthread_private.h"
 
 int
-fcntl(int fd, int cmd,...)
+_libc_fcntl(int fd, int cmd,...)
 {
 	int             flags = 0;
 	int		nonblock;
@@ -142,4 +142,6 @@ fcntl(int fd, int cmd,...)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_fcntl, fcntl);
 #endif
diff --git a/lib/libc_r/uthread/uthread_flock.c b/lib/libc_r/uthread/uthread_flock.c
index 901ab9d0740c..20de6dc42796 100644
--- a/lib/libc_r/uthread/uthread_flock.c
+++ b/lib/libc_r/uthread/uthread_flock.c
@@ -37,7 +37,7 @@
 #include "pthread_private.h"
 
 int
-flock(int fd, int operation)
+_libc_flock(int fd, int operation)
 {
 	int             ret;
 
@@ -47,4 +47,6 @@ flock(int fd, int operation)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_flock, flock);
 #endif
diff --git a/lib/libc_r/uthread/uthread_fork.c b/lib/libc_r/uthread/uthread_fork.c
index 08ea8129ea71..8c112e8b2796 100644
--- a/lib/libc_r/uthread/uthread_fork.c
+++ b/lib/libc_r/uthread/uthread_fork.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 pid_t
-fork(void)
+_libc_fork(void)
 {
 	int             i, flags;
 	pid_t           ret;
@@ -220,4 +220,6 @@ fork(void)
 	/* Return the process ID: */
 	return (ret);
 }
+
+__weak_reference(_libc_fork, fork);
 #endif
diff --git a/lib/libc_r/uthread/uthread_fstat.c b/lib/libc_r/uthread/uthread_fstat.c
index 8e9e7a4bdcec..3f182c366078 100644
--- a/lib/libc_r/uthread/uthread_fstat.c
+++ b/lib/libc_r/uthread/uthread_fstat.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 int
-fstat(int fd, struct stat * buf)
+_libc_fstat(int fd, struct stat * buf)
 {
 	int             ret;
 
@@ -55,4 +55,6 @@ fstat(int fd, struct stat * buf)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_fstat, fstat);
 #endif
diff --git a/lib/libc_r/uthread/uthread_fstatfs.c b/lib/libc_r/uthread/uthread_fstatfs.c
index d7a8a21863b9..84ef0bd85998 100644
--- a/lib/libc_r/uthread/uthread_fstatfs.c
+++ b/lib/libc_r/uthread/uthread_fstatfs.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 int
-fstatfs(int fd, struct statfs * buf)
+_libc_fstatfs(int fd, struct statfs * buf)
 {
 	int             ret;
 
@@ -55,4 +55,6 @@ fstatfs(int fd, struct statfs * buf)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_fstatfs, fstatfs);
 #endif
diff --git a/lib/libc_r/uthread/uthread_fsync.c b/lib/libc_r/uthread/uthread_fsync.c
index 21c3b568b44e..048e60b0a91a 100644
--- a/lib/libc_r/uthread/uthread_fsync.c
+++ b/lib/libc_r/uthread/uthread_fsync.c
@@ -37,7 +37,7 @@
 #include "pthread_private.h"
 
 int
-fsync(int fd)
+_libc_fsync(int fd)
 {
 	int             ret;
 
@@ -49,4 +49,6 @@ fsync(int fd)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_fsync, fsync);
 #endif
diff --git a/lib/libc_r/uthread/uthread_getdirentries.c b/lib/libc_r/uthread/uthread_getdirentries.c
index e3c5c7637122..0bd4c8581bd8 100644
--- a/lib/libc_r/uthread/uthread_getdirentries.c
+++ b/lib/libc_r/uthread/uthread_getdirentries.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-getdirentries(int fd, char *buf, int nbytes, long *basep)
+_libc_getdirentries(int fd, char *buf, int nbytes, long *basep)
 {
 	int             ret;
 
@@ -48,4 +48,6 @@ getdirentries(int fd, char *buf, int nbytes, long *basep)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_getdirentries, getdirentries);
 #endif
diff --git a/lib/libc_r/uthread/uthread_getpeername.c b/lib/libc_r/uthread/uthread_getpeername.c
index 4e972a6d499b..94c87d6e001a 100644
--- a/lib/libc_r/uthread/uthread_getpeername.c
+++ b/lib/libc_r/uthread/uthread_getpeername.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-getpeername(int fd, struct sockaddr * peer, socklen_t *paddrlen)
+_libc_getpeername(int fd, struct sockaddr * peer, socklen_t *paddrlen)
 {
 	int             ret;
 
@@ -48,4 +48,6 @@ getpeername(int fd, struct sockaddr * peer, socklen_t *paddrlen)
 	}
 	return ret;
 }
+
+__weak_reference(_libc_getpeername, getpeername);
 #endif
diff --git a/lib/libc_r/uthread/uthread_getsockname.c b/lib/libc_r/uthread/uthread_getsockname.c
index 691394c8b27e..91d11fe4cfe7 100644
--- a/lib/libc_r/uthread/uthread_getsockname.c
+++ b/lib/libc_r/uthread/uthread_getsockname.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-getsockname(int s, struct sockaddr * name, socklen_t *namelen)
+_libc_getsockname(int s, struct sockaddr * name, socklen_t *namelen)
 {
 	int             ret;
 
@@ -48,4 +48,6 @@ getsockname(int s, struct sockaddr * name, socklen_t *namelen)
 	}
 	return ret;
 }
+
+__weak_reference(_libc_getsockname, getsockname);
 #endif
diff --git a/lib/libc_r/uthread/uthread_getsockopt.c b/lib/libc_r/uthread/uthread_getsockopt.c
index ad293fab6600..a698c2bac27c 100644
--- a/lib/libc_r/uthread/uthread_getsockopt.c
+++ b/lib/libc_r/uthread/uthread_getsockopt.c
@@ -38,7 +38,8 @@
 #include "pthread_private.h"
 
 int
-getsockopt(int fd, int level, int optname, void *optval, socklen_t *optlen)
+_libc_getsockopt(int fd, int level, int optname, void *optval, socklen_t
+    *optlen)
 {
 	int             ret;
 
@@ -48,4 +49,6 @@ getsockopt(int fd, int level, int optname, void *optval, socklen_t *optlen)
 	}
 	return ret;
 }
+
+__weak_reference(_libc_getsockopt, getsockopt);
 #endif
diff --git a/lib/libc_r/uthread/uthread_ioctl.c b/lib/libc_r/uthread/uthread_ioctl.c
index f2c4531a2a70..185764307878 100644
--- a/lib/libc_r/uthread/uthread_ioctl.c
+++ b/lib/libc_r/uthread/uthread_ioctl.c
@@ -39,7 +39,7 @@
 #include "pthread_private.h"
 
 int
-ioctl(int fd, unsigned long request,...)
+_libc_ioctl(int fd, unsigned long request,...)
 {
 	int             ret;
 	int		*op;
@@ -76,4 +76,6 @@ ioctl(int fd, unsigned long request,...)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_ioctl, ioctl);
 #endif
diff --git a/lib/libc_r/uthread/uthread_listen.c b/lib/libc_r/uthread/uthread_listen.c
index dc901072243c..00ffe5b924e9 100644
--- a/lib/libc_r/uthread/uthread_listen.c
+++ b/lib/libc_r/uthread/uthread_listen.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-listen(int fd, int backlog)
+_libc_listen(int fd, int backlog)
 {
 	int             ret;
 
@@ -48,4 +48,6 @@ listen(int fd, int backlog)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_listen, listen);
 #endif
diff --git a/lib/libc_r/uthread/uthread_msync.c b/lib/libc_r/uthread/uthread_msync.c
index 209286d2d1a6..9559ec416291 100644
--- a/lib/libc_r/uthread/uthread_msync.c
+++ b/lib/libc_r/uthread/uthread_msync.c
@@ -13,7 +13,7 @@
 #include "pthread_private.h"
 
 int
-msync(addr, len, flags)
+_libc_msync(addr, len, flags)
 	void *addr;
 	size_t len;
 	int flags;
@@ -37,4 +37,6 @@ msync(addr, len, flags)
 
 	return (ret);
 }
+
+__weak_reference(_libc_msync, msync);
 #endif
diff --git a/lib/libc_r/uthread/uthread_multi_np.c b/lib/libc_r/uthread/uthread_multi_np.c
index 39dd948cbc4f..9a2f7c1ece49 100644
--- a/lib/libc_r/uthread/uthread_multi_np.c
+++ b/lib/libc_r/uthread/uthread_multi_np.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_multi_np()
+int
+pthread_multi_np()
 {
 	/* Return to multi-threaded scheduling mode: */
 	_thread_single = NULL;
diff --git a/lib/libc_r/uthread/uthread_mutex.c b/lib/libc_r/uthread/uthread_mutex.c
index c625ef26e900..6526a3579c8b 100644
--- a/lib/libc_r/uthread/uthread_mutex.c
+++ b/lib/libc_r/uthread/uthread_mutex.c
@@ -243,7 +243,7 @@ pthread_mutex_destroy(pthread_mutex_t * mutex)
 }
 
 static int
-init_static (pthread_mutex_t *mutex)
+init_static(pthread_mutex_t *mutex)
 {
 	int ret;
 
@@ -1219,7 +1219,7 @@ mutex_priority_adjust(pthread_mutex_t mutex)
 }
 
 static void
-mutex_rescan_owned (pthread_t pthread, pthread_mutex_t mutex)
+mutex_rescan_owned(pthread_t pthread, pthread_mutex_t mutex)
 {
 	int		active_prio, inherited_prio;
 	pthread_mutex_t	m;
diff --git a/lib/libc_r/uthread/uthread_mutexattr_destroy.c b/lib/libc_r/uthread/uthread_mutexattr_destroy.c
index 9afebad917d2..6eed2a256019 100644
--- a/lib/libc_r/uthread/uthread_mutexattr_destroy.c
+++ b/lib/libc_r/uthread/uthread_mutexattr_destroy.c
@@ -37,7 +37,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
+int
+pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
 {
 	int	ret;
 	if (attr == NULL || *attr == NULL) {
diff --git a/lib/libc_r/uthread/uthread_nanosleep.c b/lib/libc_r/uthread/uthread_nanosleep.c
index e4772b4fe2a9..e9052f983480 100644
--- a/lib/libc_r/uthread/uthread_nanosleep.c
+++ b/lib/libc_r/uthread/uthread_nanosleep.c
@@ -38,8 +38,8 @@
 #include "pthread_private.h"
 
 int
-nanosleep(const struct timespec * time_to_sleep,
-		  struct timespec * time_remaining)
+_libc_nanosleep(const struct timespec * time_to_sleep,
+    struct timespec * time_remaining)
 {
 	int             ret = 0;
 	struct timespec current_time;
@@ -120,4 +120,6 @@ nanosleep(const struct timespec * time_to_sleep,
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_nanosleep, nanosleep);
 #endif
diff --git a/lib/libc_r/uthread/uthread_open.c b/lib/libc_r/uthread/uthread_open.c
index 4e9993eb6585..4bc2f1a513e3 100644
--- a/lib/libc_r/uthread/uthread_open.c
+++ b/lib/libc_r/uthread/uthread_open.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 int
-open(const char *path, int flags,...)
+_libc_open(const char *path, int flags,...)
 {
 	int	fd;
 	int	mode = 0;
@@ -74,4 +74,6 @@ open(const char *path, int flags,...)
 	/* Return the file descriptor or -1 on error: */
 	return (fd);
 }
+
+__weak_reference(_libc_open, open);
 #endif
diff --git a/lib/libc_r/uthread/uthread_pipe.c b/lib/libc_r/uthread/uthread_pipe.c
index 72ed6c9f095a..b815e1af4879 100644
--- a/lib/libc_r/uthread/uthread_pipe.c
+++ b/lib/libc_r/uthread/uthread_pipe.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-pipe(int fds[2])
+_libc_pipe(int fds[2])
 {
 	int             ret;
 	if ((ret = _thread_sys_pipe(fds)) >= 0) {
@@ -51,4 +51,6 @@ pipe(int fds[2])
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_pipe, pipe);
 #endif
diff --git a/lib/libc_r/uthread/uthread_poll.c b/lib/libc_r/uthread/uthread_poll.c
index 10a9db74e359..ce2b7af56bc1 100644
--- a/lib/libc_r/uthread/uthread_poll.c
+++ b/lib/libc_r/uthread/uthread_poll.c
@@ -44,7 +44,7 @@
 
 
 int 
-poll(struct pollfd *fds, unsigned int nfds, int timeout)
+_libc_poll(struct pollfd *fds, unsigned int nfds, int timeout)
 {
 	struct timespec	ts;
 	int		numfds = nfds;
@@ -96,4 +96,6 @@ poll(struct pollfd *fds, unsigned int nfds, int timeout)
 
 	return (ret);
 }
+
+__weak_reference(_libc_poll, poll);
 #endif
diff --git a/lib/libc_r/uthread/uthread_read.c b/lib/libc_r/uthread/uthread_read.c
index 8cbb5be7b7b0..ad66df368c25 100644
--- a/lib/libc_r/uthread/uthread_read.c
+++ b/lib/libc_r/uthread/uthread_read.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-read(int fd, void *buf, size_t nbytes)
+_libc_read(int fd, void *buf, size_t nbytes)
 {
 	int	ret;
 	int	type;
@@ -100,4 +100,6 @@ read(int fd, void *buf, size_t nbytes)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_read, read);
 #endif
diff --git a/lib/libc_r/uthread/uthread_readv.c b/lib/libc_r/uthread/uthread_readv.c
index a1a862d42490..c1965d834f8a 100644
--- a/lib/libc_r/uthread/uthread_readv.c
+++ b/lib/libc_r/uthread/uthread_readv.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-readv(int fd, const struct iovec * iov, int iovcnt)
+_libc_readv(int fd, const struct iovec * iov, int iovcnt)
 {
 	int	ret;
 	int	type;
@@ -90,4 +90,6 @@ readv(int fd, const struct iovec * iov, int iovcnt)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_readv, readv);
 #endif
diff --git a/lib/libc_r/uthread/uthread_recvfrom.c b/lib/libc_r/uthread/uthread_recvfrom.c
index 3130dfdf7247..897e218a4a95 100644
--- a/lib/libc_r/uthread/uthread_recvfrom.c
+++ b/lib/libc_r/uthread/uthread_recvfrom.c
@@ -40,7 +40,8 @@
 #include "pthread_private.h"
 
 ssize_t
-recvfrom(int fd, void *buf, size_t len, int flags, struct sockaddr * from, socklen_t *from_len)
+_libc_recvfrom(int fd, void *buf, size_t len, int flags, struct sockaddr * from,
+    socklen_t *from_len)
 {
 	int             ret;
 
@@ -70,4 +71,6 @@ recvfrom(int fd, void *buf, size_t len, int flags, struct sockaddr * from, sockl
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_recvfrom, recvfrom);
 #endif
diff --git a/lib/libc_r/uthread/uthread_recvmsg.c b/lib/libc_r/uthread/uthread_recvmsg.c
index dff8941eb401..d89c963a083f 100644
--- a/lib/libc_r/uthread/uthread_recvmsg.c
+++ b/lib/libc_r/uthread/uthread_recvmsg.c
@@ -40,7 +40,7 @@
 #include "pthread_private.h"
 
 ssize_t
-recvmsg(int fd, struct msghdr *msg, int flags)
+_libc_recvmsg(int fd, struct msghdr *msg, int flags)
 {
 	int             ret;
 
@@ -70,4 +70,6 @@ recvmsg(int fd, struct msghdr *msg, int flags)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_recvmsg, recvmsg);
 #endif
diff --git a/lib/libc_r/uthread/uthread_rwlockattr.c b/lib/libc_r/uthread/uthread_rwlockattr.c
index 7a56bca7d4ba..37eb3eae66a9 100644
--- a/lib/libc_r/uthread/uthread_rwlockattr.c
+++ b/lib/libc_r/uthread/uthread_rwlockattr.c
@@ -34,7 +34,7 @@
 #include "pthread_private.h"
 
 int
-pthread_rwlockattr_destroy (pthread_rwlockattr_t *rwlockattr)
+pthread_rwlockattr_destroy(pthread_rwlockattr_t *rwlockattr)
 {
 	pthread_rwlockattr_t prwlockattr;
 
@@ -52,7 +52,7 @@ pthread_rwlockattr_destroy (pthread_rwlockattr_t *rwlockattr)
 }
 
 int
-pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *rwlockattr,
+pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *rwlockattr,
 	int *pshared)
 {
 	*pshared = (*rwlockattr)->pshared;
@@ -61,7 +61,7 @@ pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *rwlockattr,
 }
 
 int
-pthread_rwlockattr_init (pthread_rwlockattr_t *rwlockattr)
+pthread_rwlockattr_init(pthread_rwlockattr_t *rwlockattr)
 {
 	pthread_rwlockattr_t prwlockattr;
 
@@ -81,7 +81,7 @@ pthread_rwlockattr_init (pthread_rwlockattr_t *rwlockattr)
 }
 
 int
-pthread_rwlockattr_setpshared (pthread_rwlockattr_t *rwlockattr, int pshared)
+pthread_rwlockattr_setpshared(pthread_rwlockattr_t *rwlockattr, int pshared)
 {
 	/* Only PTHREAD_PROCESS_PRIVATE is supported. */
 	if (pshared != PTHREAD_PROCESS_PRIVATE)
diff --git a/lib/libc_r/uthread/uthread_select.c b/lib/libc_r/uthread/uthread_select.c
index 9bfae89be374..a7ceeccfe8ae 100644
--- a/lib/libc_r/uthread/uthread_select.c
+++ b/lib/libc_r/uthread/uthread_select.c
@@ -45,8 +45,8 @@
 #include "pthread_private.h"
 
 int 
-select(int numfds, fd_set * readfds, fd_set * writefds,
-       fd_set * exceptfds, struct timeval * timeout)
+_libc_select(int numfds, fd_set * readfds, fd_set * writefds, fd_set *
+    exceptfds, struct timeval * timeout)
 {
 	struct timespec ts;
 	int             i, ret = 0, f_wait = 1;
@@ -203,4 +203,6 @@ select(int numfds, fd_set * readfds, fd_set * writefds,
 
 	return (ret);
 }
+
+__weak_reference(_libc_select, select);
 #endif
diff --git a/lib/libc_r/uthread/uthread_sendmsg.c b/lib/libc_r/uthread/uthread_sendmsg.c
index 6834104a15dd..d280519978b3 100644
--- a/lib/libc_r/uthread/uthread_sendmsg.c
+++ b/lib/libc_r/uthread/uthread_sendmsg.c
@@ -40,7 +40,7 @@
 #include "pthread_private.h"
 
 ssize_t
-sendmsg(int fd, const struct msghdr *msg, int flags)
+_libc_sendmsg(int fd, const struct msghdr *msg, int flags)
 {
 	int             ret;
 
@@ -69,4 +69,6 @@ sendmsg(int fd, const struct msghdr *msg, int flags)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_sendmsg, sendmsg);
 #endif
diff --git a/lib/libc_r/uthread/uthread_sendto.c b/lib/libc_r/uthread/uthread_sendto.c
index 348affc14b1d..dc134bc1524c 100644
--- a/lib/libc_r/uthread/uthread_sendto.c
+++ b/lib/libc_r/uthread/uthread_sendto.c
@@ -40,7 +40,8 @@
 #include "pthread_private.h"
 
 ssize_t
-sendto(int fd, const void *msg, size_t len, int flags, const struct sockaddr * to, socklen_t to_len)
+_libc_sendto(int fd, const void *msg, size_t len, int flags, const struct
+    sockaddr * to, socklen_t to_len)
 {
 	int             ret;
 
@@ -69,4 +70,6 @@ sendto(int fd, const void *msg, size_t len, int flags, const struct sockaddr * t
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_sendto, sendto);
 #endif
diff --git a/lib/libc_r/uthread/uthread_setsockopt.c b/lib/libc_r/uthread/uthread_setsockopt.c
index ed1155b31ecc..eb917f50c730 100644
--- a/lib/libc_r/uthread/uthread_setsockopt.c
+++ b/lib/libc_r/uthread/uthread_setsockopt.c
@@ -38,7 +38,8 @@
 #include "pthread_private.h"
 
 int
-setsockopt(int fd, int level, int optname, const void *optval, socklen_t optlen)
+_libc_setsockopt(int fd, int level, int optname, const void *optval, socklen_t
+    optlen)
 {
 	int             ret;
 
@@ -48,4 +49,6 @@ setsockopt(int fd, int level, int optname, const void *optval, socklen_t optlen)
 	}
 	return ret;
 }
+
+__weak_reference(_libc_setsockopt, setsockopt);
 #endif
diff --git a/lib/libc_r/uthread/uthread_shutdown.c b/lib/libc_r/uthread/uthread_shutdown.c
index ccb087de81fd..cffe4b6d7868 100644
--- a/lib/libc_r/uthread/uthread_shutdown.c
+++ b/lib/libc_r/uthread/uthread_shutdown.c
@@ -39,7 +39,7 @@
 #include "pthread_private.h"
 
 int
-shutdown(int fd, int how)
+_libc_shutdown(int fd, int how)
 {
 	int             ret;
 
@@ -69,4 +69,6 @@ shutdown(int fd, int how)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_shutdown, shutdown);
 #endif
diff --git a/lib/libc_r/uthread/uthread_sigaction.c b/lib/libc_r/uthread/uthread_sigaction.c
index 7fa8ebff330d..f2f728685ec3 100644
--- a/lib/libc_r/uthread/uthread_sigaction.c
+++ b/lib/libc_r/uthread/uthread_sigaction.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
+_libc_sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 {
 	int ret = 0;
 	struct sigaction gact;
@@ -105,4 +105,6 @@ sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigaction, sigaction);
 #endif
diff --git a/lib/libc_r/uthread/uthread_sigpending.c b/lib/libc_r/uthread/uthread_sigpending.c
index 2d61e2104788..feb430011c4b 100644
--- a/lib/libc_r/uthread/uthread_sigpending.c
+++ b/lib/libc_r/uthread/uthread_sigpending.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigpending(sigset_t * set)
+_libc_sigpending(sigset_t * set)
 {
 	int ret = 0;
 
@@ -53,4 +53,6 @@ sigpending(sigset_t * set)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigpending, sigpending);
 #endif
diff --git a/lib/libc_r/uthread/uthread_sigprocmask.c b/lib/libc_r/uthread/uthread_sigprocmask.c
index 592a61e865eb..28ab4fab7d7d 100644
--- a/lib/libc_r/uthread/uthread_sigprocmask.c
+++ b/lib/libc_r/uthread/uthread_sigprocmask.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 int
-sigprocmask(int how, const sigset_t * set, sigset_t * oset)
+_libc_sigprocmask(int how, const sigset_t * set, sigset_t * oset)
 {
 	int ret = 0;
 
@@ -89,4 +89,6 @@ sigprocmask(int how, const sigset_t * set, sigset_t * oset)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigprocmask, sigprocmask);
 #endif
diff --git a/lib/libc_r/uthread/uthread_sigsuspend.c b/lib/libc_r/uthread/uthread_sigsuspend.c
index ac06ff71ba46..b64897a6f3a1 100644
--- a/lib/libc_r/uthread/uthread_sigsuspend.c
+++ b/lib/libc_r/uthread/uthread_sigsuspend.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigsuspend(const sigset_t * set)
+_libc_sigsuspend(const sigset_t * set)
 {
 	int             ret = -1;
 	sigset_t        oset;
@@ -67,4 +67,6 @@ sigsuspend(const sigset_t * set)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigsuspend, sigsuspend);
 #endif
diff --git a/lib/libc_r/uthread/uthread_socket.c b/lib/libc_r/uthread/uthread_socket.c
index 5772bc835eee..bab70dfd2106 100644
--- a/lib/libc_r/uthread/uthread_socket.c
+++ b/lib/libc_r/uthread/uthread_socket.c
@@ -40,7 +40,7 @@
 #include "pthread_private.h"
 
 int
-socket(int af, int type, int protocol)
+_libc_socket(int af, int type, int protocol)
 {
 	int fd;
 
@@ -55,4 +55,6 @@ socket(int af, int type, int protocol)
 	}
 	return (fd);
 }
+
+__weak_reference(_libc_socket, socket);
 #endif
diff --git a/lib/libc_r/uthread/uthread_socketpair.c b/lib/libc_r/uthread/uthread_socketpair.c
index 47386d33a6ff..f35ab94f94c9 100644
--- a/lib/libc_r/uthread/uthread_socketpair.c
+++ b/lib/libc_r/uthread/uthread_socketpair.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 int
-socketpair(int af, int type, int protocol, int pair[2])
+_libc_socketpair(int af, int type, int protocol, int pair[2])
 {
 	int             ret;
 	if (!((ret = _thread_sys_socketpair(af, type, protocol, pair)) < 0))
@@ -53,4 +53,6 @@ socketpair(int af, int type, int protocol, int pair[2])
 		}
 	return (ret);
 }
+
+__weak_reference(_libc_socketpair, socketpair);
 #endif
diff --git a/lib/libc_r/uthread/uthread_wait4.c b/lib/libc_r/uthread/uthread_wait4.c
index 4a58a70faf6f..4c3f1dee1a20 100644
--- a/lib/libc_r/uthread/uthread_wait4.c
+++ b/lib/libc_r/uthread/uthread_wait4.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 pid_t
-wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
+_libc_wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
 {
 	pid_t	ret;
 
@@ -66,4 +66,6 @@ wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
 
 	return (ret);
 }
+
+__weak_reference(_libc_wait4, wait4);
 #endif
diff --git a/lib/libc_r/uthread/uthread_write.c b/lib/libc_r/uthread/uthread_write.c
index 40c4cc574241..f25c6065b911 100644
--- a/lib/libc_r/uthread/uthread_write.c
+++ b/lib/libc_r/uthread/uthread_write.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-write(int fd, const void *buf, size_t nbytes)
+_libc_write(int fd, const void *buf, size_t nbytes)
 {
 	int	blocking;
 	int	type;
@@ -136,4 +136,6 @@ write(int fd, const void *buf, size_t nbytes)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_write, write);
 #endif
diff --git a/lib/libc_r/uthread/uthread_writev.c b/lib/libc_r/uthread/uthread_writev.c
index 375f59912b6f..74da5219ff92 100644
--- a/lib/libc_r/uthread/uthread_writev.c
+++ b/lib/libc_r/uthread/uthread_writev.c
@@ -44,7 +44,7 @@
 #include "pthread_private.h"
 
 ssize_t
-writev(int fd, const struct iovec * iov, int iovcnt)
+_libc_writev(int fd, const struct iovec * iov, int iovcnt)
 {
 	int	blocking;
 	int	idx = 0;
@@ -200,4 +200,6 @@ writev(int fd, const struct iovec * iov, int iovcnt)
 
 	return (ret);
 }
+
+__weak_reference(_libc_writev, writev);
 #endif
diff --git a/lib/libkse/thread/thr_attr_setdetachstate.c b/lib/libkse/thread/thr_attr_setdetachstate.c
index 36a846a34abf..6be3e4ee73b3 100644
--- a/lib/libkse/thread/thr_attr_setdetachstate.c
+++ b/lib/libkse/thread/thr_attr_setdetachstate.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
+int
+pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
 {
 	int	ret;
 
diff --git a/lib/libkse/thread/thr_attr_setstackaddr.c b/lib/libkse/thread/thr_attr_setstackaddr.c
index 7eb8c5d1319c..46469e4faf87 100644
--- a/lib/libkse/thread/thr_attr_setstackaddr.c
+++ b/lib/libkse/thread/thr_attr_setstackaddr.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
+int
+pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
 {
 	int	ret;
 
diff --git a/lib/libkse/thread/thr_attr_setstacksize.c b/lib/libkse/thread/thr_attr_setstacksize.c
index 2a2d85482e0a..3897811bb436 100644
--- a/lib/libkse/thread/thr_attr_setstacksize.c
+++ b/lib/libkse/thread/thr_attr_setstacksize.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
+int
+pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
 {
 	int	ret;
 
diff --git a/lib/libkse/thread/thr_close.c b/lib/libkse/thread/thr_close.c
index 2580fcef02c5..fe2d9e2a4622 100644
--- a/lib/libkse/thread/thr_close.c
+++ b/lib/libkse/thread/thr_close.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 int
-close(int fd)
+_libc_close(int fd)
 {
 	int		flags;
 	int		ret;
@@ -102,4 +102,6 @@ close(int fd)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_close, close);
 #endif
diff --git a/lib/libkse/thread/thr_exit.c b/lib/libkse/thread/thr_exit.c
index abe4b278861d..57ac1141e251 100644
--- a/lib/libkse/thread/thr_exit.c
+++ b/lib/libkse/thread/thr_exit.c
@@ -41,7 +41,7 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-void _exit(int status)
+void _libc__exit(int status)
 {
 	int		flags;
 	int             i;
@@ -77,6 +77,8 @@ void _exit(int status)
 	_thread_sys__exit(status);
 }
 
+__weak_reference(_libc__exit, _exit);
+
 void
 _thread_exit(char *fname, int lineno, char *string)
 {
diff --git a/lib/libkse/thread/thr_fcntl.c b/lib/libkse/thread/thr_fcntl.c
index 878554cdbc1d..6cd2b12dd5cd 100644
--- a/lib/libkse/thread/thr_fcntl.c
+++ b/lib/libkse/thread/thr_fcntl.c
@@ -39,7 +39,7 @@
 #include "pthread_private.h"
 
 int
-fcntl(int fd, int cmd,...)
+_libc_fcntl(int fd, int cmd,...)
 {
 	int             flags = 0;
 	int		nonblock;
@@ -142,4 +142,6 @@ fcntl(int fd, int cmd,...)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_fcntl, fcntl);
 #endif
diff --git a/lib/libkse/thread/thr_fork.c b/lib/libkse/thread/thr_fork.c
index 08ea8129ea71..8c112e8b2796 100644
--- a/lib/libkse/thread/thr_fork.c
+++ b/lib/libkse/thread/thr_fork.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 pid_t
-fork(void)
+_libc_fork(void)
 {
 	int             i, flags;
 	pid_t           ret;
@@ -220,4 +220,6 @@ fork(void)
 	/* Return the process ID: */
 	return (ret);
 }
+
+__weak_reference(_libc_fork, fork);
 #endif
diff --git a/lib/libkse/thread/thr_fsync.c b/lib/libkse/thread/thr_fsync.c
index 21c3b568b44e..048e60b0a91a 100644
--- a/lib/libkse/thread/thr_fsync.c
+++ b/lib/libkse/thread/thr_fsync.c
@@ -37,7 +37,7 @@
 #include "pthread_private.h"
 
 int
-fsync(int fd)
+_libc_fsync(int fd)
 {
 	int             ret;
 
@@ -49,4 +49,6 @@ fsync(int fd)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_fsync, fsync);
 #endif
diff --git a/lib/libkse/thread/thr_msync.c b/lib/libkse/thread/thr_msync.c
index 209286d2d1a6..9559ec416291 100644
--- a/lib/libkse/thread/thr_msync.c
+++ b/lib/libkse/thread/thr_msync.c
@@ -13,7 +13,7 @@
 #include "pthread_private.h"
 
 int
-msync(addr, len, flags)
+_libc_msync(addr, len, flags)
 	void *addr;
 	size_t len;
 	int flags;
@@ -37,4 +37,6 @@ msync(addr, len, flags)
 
 	return (ret);
 }
+
+__weak_reference(_libc_msync, msync);
 #endif
diff --git a/lib/libkse/thread/thr_multi_np.c b/lib/libkse/thread/thr_multi_np.c
index 39dd948cbc4f..9a2f7c1ece49 100644
--- a/lib/libkse/thread/thr_multi_np.c
+++ b/lib/libkse/thread/thr_multi_np.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_multi_np()
+int
+pthread_multi_np()
 {
 	/* Return to multi-threaded scheduling mode: */
 	_thread_single = NULL;
diff --git a/lib/libkse/thread/thr_mutex.c b/lib/libkse/thread/thr_mutex.c
index c625ef26e900..6526a3579c8b 100644
--- a/lib/libkse/thread/thr_mutex.c
+++ b/lib/libkse/thread/thr_mutex.c
@@ -243,7 +243,7 @@ pthread_mutex_destroy(pthread_mutex_t * mutex)
 }
 
 static int
-init_static (pthread_mutex_t *mutex)
+init_static(pthread_mutex_t *mutex)
 {
 	int ret;
 
@@ -1219,7 +1219,7 @@ mutex_priority_adjust(pthread_mutex_t mutex)
 }
 
 static void
-mutex_rescan_owned (pthread_t pthread, pthread_mutex_t mutex)
+mutex_rescan_owned(pthread_t pthread, pthread_mutex_t mutex)
 {
 	int		active_prio, inherited_prio;
 	pthread_mutex_t	m;
diff --git a/lib/libkse/thread/thr_mutexattr_destroy.c b/lib/libkse/thread/thr_mutexattr_destroy.c
index 9afebad917d2..6eed2a256019 100644
--- a/lib/libkse/thread/thr_mutexattr_destroy.c
+++ b/lib/libkse/thread/thr_mutexattr_destroy.c
@@ -37,7 +37,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
+int
+pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
 {
 	int	ret;
 	if (attr == NULL || *attr == NULL) {
diff --git a/lib/libkse/thread/thr_nanosleep.c b/lib/libkse/thread/thr_nanosleep.c
index e4772b4fe2a9..e9052f983480 100644
--- a/lib/libkse/thread/thr_nanosleep.c
+++ b/lib/libkse/thread/thr_nanosleep.c
@@ -38,8 +38,8 @@
 #include "pthread_private.h"
 
 int
-nanosleep(const struct timespec * time_to_sleep,
-		  struct timespec * time_remaining)
+_libc_nanosleep(const struct timespec * time_to_sleep,
+    struct timespec * time_remaining)
 {
 	int             ret = 0;
 	struct timespec current_time;
@@ -120,4 +120,6 @@ nanosleep(const struct timespec * time_to_sleep,
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_nanosleep, nanosleep);
 #endif
diff --git a/lib/libkse/thread/thr_open.c b/lib/libkse/thread/thr_open.c
index 4e9993eb6585..4bc2f1a513e3 100644
--- a/lib/libkse/thread/thr_open.c
+++ b/lib/libkse/thread/thr_open.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 int
-open(const char *path, int flags,...)
+_libc_open(const char *path, int flags,...)
 {
 	int	fd;
 	int	mode = 0;
@@ -74,4 +74,6 @@ open(const char *path, int flags,...)
 	/* Return the file descriptor or -1 on error: */
 	return (fd);
 }
+
+__weak_reference(_libc_open, open);
 #endif
diff --git a/lib/libkse/thread/thr_poll.c b/lib/libkse/thread/thr_poll.c
index 10a9db74e359..ce2b7af56bc1 100644
--- a/lib/libkse/thread/thr_poll.c
+++ b/lib/libkse/thread/thr_poll.c
@@ -44,7 +44,7 @@
 
 
 int 
-poll(struct pollfd *fds, unsigned int nfds, int timeout)
+_libc_poll(struct pollfd *fds, unsigned int nfds, int timeout)
 {
 	struct timespec	ts;
 	int		numfds = nfds;
@@ -96,4 +96,6 @@ poll(struct pollfd *fds, unsigned int nfds, int timeout)
 
 	return (ret);
 }
+
+__weak_reference(_libc_poll, poll);
 #endif
diff --git a/lib/libkse/thread/thr_read.c b/lib/libkse/thread/thr_read.c
index 8cbb5be7b7b0..ad66df368c25 100644
--- a/lib/libkse/thread/thr_read.c
+++ b/lib/libkse/thread/thr_read.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-read(int fd, void *buf, size_t nbytes)
+_libc_read(int fd, void *buf, size_t nbytes)
 {
 	int	ret;
 	int	type;
@@ -100,4 +100,6 @@ read(int fd, void *buf, size_t nbytes)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_read, read);
 #endif
diff --git a/lib/libkse/thread/thr_readv.c b/lib/libkse/thread/thr_readv.c
index a1a862d42490..c1965d834f8a 100644
--- a/lib/libkse/thread/thr_readv.c
+++ b/lib/libkse/thread/thr_readv.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-readv(int fd, const struct iovec * iov, int iovcnt)
+_libc_readv(int fd, const struct iovec * iov, int iovcnt)
 {
 	int	ret;
 	int	type;
@@ -90,4 +90,6 @@ readv(int fd, const struct iovec * iov, int iovcnt)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_readv, readv);
 #endif
diff --git a/lib/libkse/thread/thr_rwlockattr.c b/lib/libkse/thread/thr_rwlockattr.c
index 7a56bca7d4ba..37eb3eae66a9 100644
--- a/lib/libkse/thread/thr_rwlockattr.c
+++ b/lib/libkse/thread/thr_rwlockattr.c
@@ -34,7 +34,7 @@
 #include "pthread_private.h"
 
 int
-pthread_rwlockattr_destroy (pthread_rwlockattr_t *rwlockattr)
+pthread_rwlockattr_destroy(pthread_rwlockattr_t *rwlockattr)
 {
 	pthread_rwlockattr_t prwlockattr;
 
@@ -52,7 +52,7 @@ pthread_rwlockattr_destroy (pthread_rwlockattr_t *rwlockattr)
 }
 
 int
-pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *rwlockattr,
+pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *rwlockattr,
 	int *pshared)
 {
 	*pshared = (*rwlockattr)->pshared;
@@ -61,7 +61,7 @@ pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *rwlockattr,
 }
 
 int
-pthread_rwlockattr_init (pthread_rwlockattr_t *rwlockattr)
+pthread_rwlockattr_init(pthread_rwlockattr_t *rwlockattr)
 {
 	pthread_rwlockattr_t prwlockattr;
 
@@ -81,7 +81,7 @@ pthread_rwlockattr_init (pthread_rwlockattr_t *rwlockattr)
 }
 
 int
-pthread_rwlockattr_setpshared (pthread_rwlockattr_t *rwlockattr, int pshared)
+pthread_rwlockattr_setpshared(pthread_rwlockattr_t *rwlockattr, int pshared)
 {
 	/* Only PTHREAD_PROCESS_PRIVATE is supported. */
 	if (pshared != PTHREAD_PROCESS_PRIVATE)
diff --git a/lib/libkse/thread/thr_select.c b/lib/libkse/thread/thr_select.c
index 9bfae89be374..a7ceeccfe8ae 100644
--- a/lib/libkse/thread/thr_select.c
+++ b/lib/libkse/thread/thr_select.c
@@ -45,8 +45,8 @@
 #include "pthread_private.h"
 
 int 
-select(int numfds, fd_set * readfds, fd_set * writefds,
-       fd_set * exceptfds, struct timeval * timeout)
+_libc_select(int numfds, fd_set * readfds, fd_set * writefds, fd_set *
+    exceptfds, struct timeval * timeout)
 {
 	struct timespec ts;
 	int             i, ret = 0, f_wait = 1;
@@ -203,4 +203,6 @@ select(int numfds, fd_set * readfds, fd_set * writefds,
 
 	return (ret);
 }
+
+__weak_reference(_libc_select, select);
 #endif
diff --git a/lib/libkse/thread/thr_sigaction.c b/lib/libkse/thread/thr_sigaction.c
index 7fa8ebff330d..f2f728685ec3 100644
--- a/lib/libkse/thread/thr_sigaction.c
+++ b/lib/libkse/thread/thr_sigaction.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
+_libc_sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 {
 	int ret = 0;
 	struct sigaction gact;
@@ -105,4 +105,6 @@ sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigaction, sigaction);
 #endif
diff --git a/lib/libkse/thread/thr_sigpending.c b/lib/libkse/thread/thr_sigpending.c
index 2d61e2104788..feb430011c4b 100644
--- a/lib/libkse/thread/thr_sigpending.c
+++ b/lib/libkse/thread/thr_sigpending.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigpending(sigset_t * set)
+_libc_sigpending(sigset_t * set)
 {
 	int ret = 0;
 
@@ -53,4 +53,6 @@ sigpending(sigset_t * set)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigpending, sigpending);
 #endif
diff --git a/lib/libkse/thread/thr_sigprocmask.c b/lib/libkse/thread/thr_sigprocmask.c
index 592a61e865eb..28ab4fab7d7d 100644
--- a/lib/libkse/thread/thr_sigprocmask.c
+++ b/lib/libkse/thread/thr_sigprocmask.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 int
-sigprocmask(int how, const sigset_t * set, sigset_t * oset)
+_libc_sigprocmask(int how, const sigset_t * set, sigset_t * oset)
 {
 	int ret = 0;
 
@@ -89,4 +89,6 @@ sigprocmask(int how, const sigset_t * set, sigset_t * oset)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigprocmask, sigprocmask);
 #endif
diff --git a/lib/libkse/thread/thr_sigsuspend.c b/lib/libkse/thread/thr_sigsuspend.c
index ac06ff71ba46..b64897a6f3a1 100644
--- a/lib/libkse/thread/thr_sigsuspend.c
+++ b/lib/libkse/thread/thr_sigsuspend.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigsuspend(const sigset_t * set)
+_libc_sigsuspend(const sigset_t * set)
 {
 	int             ret = -1;
 	sigset_t        oset;
@@ -67,4 +67,6 @@ sigsuspend(const sigset_t * set)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigsuspend, sigsuspend);
 #endif
diff --git a/lib/libkse/thread/thr_wait4.c b/lib/libkse/thread/thr_wait4.c
index 4a58a70faf6f..4c3f1dee1a20 100644
--- a/lib/libkse/thread/thr_wait4.c
+++ b/lib/libkse/thread/thr_wait4.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 pid_t
-wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
+_libc_wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
 {
 	pid_t	ret;
 
@@ -66,4 +66,6 @@ wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
 
 	return (ret);
 }
+
+__weak_reference(_libc_wait4, wait4);
 #endif
diff --git a/lib/libkse/thread/thr_write.c b/lib/libkse/thread/thr_write.c
index 40c4cc574241..f25c6065b911 100644
--- a/lib/libkse/thread/thr_write.c
+++ b/lib/libkse/thread/thr_write.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-write(int fd, const void *buf, size_t nbytes)
+_libc_write(int fd, const void *buf, size_t nbytes)
 {
 	int	blocking;
 	int	type;
@@ -136,4 +136,6 @@ write(int fd, const void *buf, size_t nbytes)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_write, write);
 #endif
diff --git a/lib/libkse/thread/thr_writev.c b/lib/libkse/thread/thr_writev.c
index 375f59912b6f..74da5219ff92 100644
--- a/lib/libkse/thread/thr_writev.c
+++ b/lib/libkse/thread/thr_writev.c
@@ -44,7 +44,7 @@
 #include "pthread_private.h"
 
 ssize_t
-writev(int fd, const struct iovec * iov, int iovcnt)
+_libc_writev(int fd, const struct iovec * iov, int iovcnt)
 {
 	int	blocking;
 	int	idx = 0;
@@ -200,4 +200,6 @@ writev(int fd, const struct iovec * iov, int iovcnt)
 
 	return (ret);
 }
+
+__weak_reference(_libc_writev, writev);
 #endif
diff --git a/lib/libpthread/thread/thr_attr_setdetachstate.c b/lib/libpthread/thread/thr_attr_setdetachstate.c
index 36a846a34abf..6be3e4ee73b3 100644
--- a/lib/libpthread/thread/thr_attr_setdetachstate.c
+++ b/lib/libpthread/thread/thr_attr_setdetachstate.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
+int
+pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
 {
 	int	ret;
 
diff --git a/lib/libpthread/thread/thr_attr_setstackaddr.c b/lib/libpthread/thread/thr_attr_setstackaddr.c
index 7eb8c5d1319c..46469e4faf87 100644
--- a/lib/libpthread/thread/thr_attr_setstackaddr.c
+++ b/lib/libpthread/thread/thr_attr_setstackaddr.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
+int
+pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
 {
 	int	ret;
 
diff --git a/lib/libpthread/thread/thr_attr_setstacksize.c b/lib/libpthread/thread/thr_attr_setstacksize.c
index 2a2d85482e0a..3897811bb436 100644
--- a/lib/libpthread/thread/thr_attr_setstacksize.c
+++ b/lib/libpthread/thread/thr_attr_setstacksize.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
+int
+pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
 {
 	int	ret;
 
diff --git a/lib/libpthread/thread/thr_close.c b/lib/libpthread/thread/thr_close.c
index 2580fcef02c5..fe2d9e2a4622 100644
--- a/lib/libpthread/thread/thr_close.c
+++ b/lib/libpthread/thread/thr_close.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 int
-close(int fd)
+_libc_close(int fd)
 {
 	int		flags;
 	int		ret;
@@ -102,4 +102,6 @@ close(int fd)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_close, close);
 #endif
diff --git a/lib/libpthread/thread/thr_exit.c b/lib/libpthread/thread/thr_exit.c
index abe4b278861d..57ac1141e251 100644
--- a/lib/libpthread/thread/thr_exit.c
+++ b/lib/libpthread/thread/thr_exit.c
@@ -41,7 +41,7 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-void _exit(int status)
+void _libc__exit(int status)
 {
 	int		flags;
 	int             i;
@@ -77,6 +77,8 @@ void _exit(int status)
 	_thread_sys__exit(status);
 }
 
+__weak_reference(_libc__exit, _exit);
+
 void
 _thread_exit(char *fname, int lineno, char *string)
 {
diff --git a/lib/libpthread/thread/thr_fcntl.c b/lib/libpthread/thread/thr_fcntl.c
index 878554cdbc1d..6cd2b12dd5cd 100644
--- a/lib/libpthread/thread/thr_fcntl.c
+++ b/lib/libpthread/thread/thr_fcntl.c
@@ -39,7 +39,7 @@
 #include "pthread_private.h"
 
 int
-fcntl(int fd, int cmd,...)
+_libc_fcntl(int fd, int cmd,...)
 {
 	int             flags = 0;
 	int		nonblock;
@@ -142,4 +142,6 @@ fcntl(int fd, int cmd,...)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_fcntl, fcntl);
 #endif
diff --git a/lib/libpthread/thread/thr_fork.c b/lib/libpthread/thread/thr_fork.c
index 08ea8129ea71..8c112e8b2796 100644
--- a/lib/libpthread/thread/thr_fork.c
+++ b/lib/libpthread/thread/thr_fork.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 pid_t
-fork(void)
+_libc_fork(void)
 {
 	int             i, flags;
 	pid_t           ret;
@@ -220,4 +220,6 @@ fork(void)
 	/* Return the process ID: */
 	return (ret);
 }
+
+__weak_reference(_libc_fork, fork);
 #endif
diff --git a/lib/libpthread/thread/thr_fsync.c b/lib/libpthread/thread/thr_fsync.c
index 21c3b568b44e..048e60b0a91a 100644
--- a/lib/libpthread/thread/thr_fsync.c
+++ b/lib/libpthread/thread/thr_fsync.c
@@ -37,7 +37,7 @@
 #include "pthread_private.h"
 
 int
-fsync(int fd)
+_libc_fsync(int fd)
 {
 	int             ret;
 
@@ -49,4 +49,6 @@ fsync(int fd)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_fsync, fsync);
 #endif
diff --git a/lib/libpthread/thread/thr_msync.c b/lib/libpthread/thread/thr_msync.c
index 209286d2d1a6..9559ec416291 100644
--- a/lib/libpthread/thread/thr_msync.c
+++ b/lib/libpthread/thread/thr_msync.c
@@ -13,7 +13,7 @@
 #include "pthread_private.h"
 
 int
-msync(addr, len, flags)
+_libc_msync(addr, len, flags)
 	void *addr;
 	size_t len;
 	int flags;
@@ -37,4 +37,6 @@ msync(addr, len, flags)
 
 	return (ret);
 }
+
+__weak_reference(_libc_msync, msync);
 #endif
diff --git a/lib/libpthread/thread/thr_multi_np.c b/lib/libpthread/thread/thr_multi_np.c
index 39dd948cbc4f..9a2f7c1ece49 100644
--- a/lib/libpthread/thread/thr_multi_np.c
+++ b/lib/libpthread/thread/thr_multi_np.c
@@ -36,7 +36,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_multi_np()
+int
+pthread_multi_np()
 {
 	/* Return to multi-threaded scheduling mode: */
 	_thread_single = NULL;
diff --git a/lib/libpthread/thread/thr_mutex.c b/lib/libpthread/thread/thr_mutex.c
index c625ef26e900..6526a3579c8b 100644
--- a/lib/libpthread/thread/thr_mutex.c
+++ b/lib/libpthread/thread/thr_mutex.c
@@ -243,7 +243,7 @@ pthread_mutex_destroy(pthread_mutex_t * mutex)
 }
 
 static int
-init_static (pthread_mutex_t *mutex)
+init_static(pthread_mutex_t *mutex)
 {
 	int ret;
 
@@ -1219,7 +1219,7 @@ mutex_priority_adjust(pthread_mutex_t mutex)
 }
 
 static void
-mutex_rescan_owned (pthread_t pthread, pthread_mutex_t mutex)
+mutex_rescan_owned(pthread_t pthread, pthread_mutex_t mutex)
 {
 	int		active_prio, inherited_prio;
 	pthread_mutex_t	m;
diff --git a/lib/libpthread/thread/thr_mutexattr_destroy.c b/lib/libpthread/thread/thr_mutexattr_destroy.c
index 9afebad917d2..6eed2a256019 100644
--- a/lib/libpthread/thread/thr_mutexattr_destroy.c
+++ b/lib/libpthread/thread/thr_mutexattr_destroy.c
@@ -37,7 +37,8 @@
 #include <pthread.h>
 #include "pthread_private.h"
 
-int pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
+int
+pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
 {
 	int	ret;
 	if (attr == NULL || *attr == NULL) {
diff --git a/lib/libpthread/thread/thr_nanosleep.c b/lib/libpthread/thread/thr_nanosleep.c
index e4772b4fe2a9..e9052f983480 100644
--- a/lib/libpthread/thread/thr_nanosleep.c
+++ b/lib/libpthread/thread/thr_nanosleep.c
@@ -38,8 +38,8 @@
 #include "pthread_private.h"
 
 int
-nanosleep(const struct timespec * time_to_sleep,
-		  struct timespec * time_remaining)
+_libc_nanosleep(const struct timespec * time_to_sleep,
+    struct timespec * time_remaining)
 {
 	int             ret = 0;
 	struct timespec current_time;
@@ -120,4 +120,6 @@ nanosleep(const struct timespec * time_to_sleep,
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_nanosleep, nanosleep);
 #endif
diff --git a/lib/libpthread/thread/thr_open.c b/lib/libpthread/thread/thr_open.c
index 4e9993eb6585..4bc2f1a513e3 100644
--- a/lib/libpthread/thread/thr_open.c
+++ b/lib/libpthread/thread/thr_open.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 int
-open(const char *path, int flags,...)
+_libc_open(const char *path, int flags,...)
 {
 	int	fd;
 	int	mode = 0;
@@ -74,4 +74,6 @@ open(const char *path, int flags,...)
 	/* Return the file descriptor or -1 on error: */
 	return (fd);
 }
+
+__weak_reference(_libc_open, open);
 #endif
diff --git a/lib/libpthread/thread/thr_poll.c b/lib/libpthread/thread/thr_poll.c
index 10a9db74e359..ce2b7af56bc1 100644
--- a/lib/libpthread/thread/thr_poll.c
+++ b/lib/libpthread/thread/thr_poll.c
@@ -44,7 +44,7 @@
 
 
 int 
-poll(struct pollfd *fds, unsigned int nfds, int timeout)
+_libc_poll(struct pollfd *fds, unsigned int nfds, int timeout)
 {
 	struct timespec	ts;
 	int		numfds = nfds;
@@ -96,4 +96,6 @@ poll(struct pollfd *fds, unsigned int nfds, int timeout)
 
 	return (ret);
 }
+
+__weak_reference(_libc_poll, poll);
 #endif
diff --git a/lib/libpthread/thread/thr_read.c b/lib/libpthread/thread/thr_read.c
index 8cbb5be7b7b0..ad66df368c25 100644
--- a/lib/libpthread/thread/thr_read.c
+++ b/lib/libpthread/thread/thr_read.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-read(int fd, void *buf, size_t nbytes)
+_libc_read(int fd, void *buf, size_t nbytes)
 {
 	int	ret;
 	int	type;
@@ -100,4 +100,6 @@ read(int fd, void *buf, size_t nbytes)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_read, read);
 #endif
diff --git a/lib/libpthread/thread/thr_readv.c b/lib/libpthread/thread/thr_readv.c
index a1a862d42490..c1965d834f8a 100644
--- a/lib/libpthread/thread/thr_readv.c
+++ b/lib/libpthread/thread/thr_readv.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-readv(int fd, const struct iovec * iov, int iovcnt)
+_libc_readv(int fd, const struct iovec * iov, int iovcnt)
 {
 	int	ret;
 	int	type;
@@ -90,4 +90,6 @@ readv(int fd, const struct iovec * iov, int iovcnt)
 	}
 	return (ret);
 }
+
+__weak_reference(_libc_readv, readv);
 #endif
diff --git a/lib/libpthread/thread/thr_rwlockattr.c b/lib/libpthread/thread/thr_rwlockattr.c
index 7a56bca7d4ba..37eb3eae66a9 100644
--- a/lib/libpthread/thread/thr_rwlockattr.c
+++ b/lib/libpthread/thread/thr_rwlockattr.c
@@ -34,7 +34,7 @@
 #include "pthread_private.h"
 
 int
-pthread_rwlockattr_destroy (pthread_rwlockattr_t *rwlockattr)
+pthread_rwlockattr_destroy(pthread_rwlockattr_t *rwlockattr)
 {
 	pthread_rwlockattr_t prwlockattr;
 
@@ -52,7 +52,7 @@ pthread_rwlockattr_destroy (pthread_rwlockattr_t *rwlockattr)
 }
 
 int
-pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *rwlockattr,
+pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *rwlockattr,
 	int *pshared)
 {
 	*pshared = (*rwlockattr)->pshared;
@@ -61,7 +61,7 @@ pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *rwlockattr,
 }
 
 int
-pthread_rwlockattr_init (pthread_rwlockattr_t *rwlockattr)
+pthread_rwlockattr_init(pthread_rwlockattr_t *rwlockattr)
 {
 	pthread_rwlockattr_t prwlockattr;
 
@@ -81,7 +81,7 @@ pthread_rwlockattr_init (pthread_rwlockattr_t *rwlockattr)
 }
 
 int
-pthread_rwlockattr_setpshared (pthread_rwlockattr_t *rwlockattr, int pshared)
+pthread_rwlockattr_setpshared(pthread_rwlockattr_t *rwlockattr, int pshared)
 {
 	/* Only PTHREAD_PROCESS_PRIVATE is supported. */
 	if (pshared != PTHREAD_PROCESS_PRIVATE)
diff --git a/lib/libpthread/thread/thr_select.c b/lib/libpthread/thread/thr_select.c
index 9bfae89be374..a7ceeccfe8ae 100644
--- a/lib/libpthread/thread/thr_select.c
+++ b/lib/libpthread/thread/thr_select.c
@@ -45,8 +45,8 @@
 #include "pthread_private.h"
 
 int 
-select(int numfds, fd_set * readfds, fd_set * writefds,
-       fd_set * exceptfds, struct timeval * timeout)
+_libc_select(int numfds, fd_set * readfds, fd_set * writefds, fd_set *
+    exceptfds, struct timeval * timeout)
 {
 	struct timespec ts;
 	int             i, ret = 0, f_wait = 1;
@@ -203,4 +203,6 @@ select(int numfds, fd_set * readfds, fd_set * writefds,
 
 	return (ret);
 }
+
+__weak_reference(_libc_select, select);
 #endif
diff --git a/lib/libpthread/thread/thr_sigaction.c b/lib/libpthread/thread/thr_sigaction.c
index 7fa8ebff330d..f2f728685ec3 100644
--- a/lib/libpthread/thread/thr_sigaction.c
+++ b/lib/libpthread/thread/thr_sigaction.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
+_libc_sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 {
 	int ret = 0;
 	struct sigaction gact;
@@ -105,4 +105,6 @@ sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigaction, sigaction);
 #endif
diff --git a/lib/libpthread/thread/thr_sigpending.c b/lib/libpthread/thread/thr_sigpending.c
index 2d61e2104788..feb430011c4b 100644
--- a/lib/libpthread/thread/thr_sigpending.c
+++ b/lib/libpthread/thread/thr_sigpending.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigpending(sigset_t * set)
+_libc_sigpending(sigset_t * set)
 {
 	int ret = 0;
 
@@ -53,4 +53,6 @@ sigpending(sigset_t * set)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigpending, sigpending);
 #endif
diff --git a/lib/libpthread/thread/thr_sigprocmask.c b/lib/libpthread/thread/thr_sigprocmask.c
index 592a61e865eb..28ab4fab7d7d 100644
--- a/lib/libpthread/thread/thr_sigprocmask.c
+++ b/lib/libpthread/thread/thr_sigprocmask.c
@@ -41,7 +41,7 @@
 #include "pthread_private.h"
 
 int
-sigprocmask(int how, const sigset_t * set, sigset_t * oset)
+_libc_sigprocmask(int how, const sigset_t * set, sigset_t * oset)
 {
 	int ret = 0;
 
@@ -89,4 +89,6 @@ sigprocmask(int how, const sigset_t * set, sigset_t * oset)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigprocmask, sigprocmask);
 #endif
diff --git a/lib/libpthread/thread/thr_sigsuspend.c b/lib/libpthread/thread/thr_sigsuspend.c
index ac06ff71ba46..b64897a6f3a1 100644
--- a/lib/libpthread/thread/thr_sigsuspend.c
+++ b/lib/libpthread/thread/thr_sigsuspend.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 int
-sigsuspend(const sigset_t * set)
+_libc_sigsuspend(const sigset_t * set)
 {
 	int             ret = -1;
 	sigset_t        oset;
@@ -67,4 +67,6 @@ sigsuspend(const sigset_t * set)
 	/* Return the completion status: */
 	return (ret);
 }
+
+__weak_reference(_libc_sigsuspend, sigsuspend);
 #endif
diff --git a/lib/libpthread/thread/thr_wait4.c b/lib/libpthread/thread/thr_wait4.c
index 4a58a70faf6f..4c3f1dee1a20 100644
--- a/lib/libpthread/thread/thr_wait4.c
+++ b/lib/libpthread/thread/thr_wait4.c
@@ -38,7 +38,7 @@
 #include "pthread_private.h"
 
 pid_t
-wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
+_libc_wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
 {
 	pid_t	ret;
 
@@ -66,4 +66,6 @@ wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
 
 	return (ret);
 }
+
+__weak_reference(_libc_wait4, wait4);
 #endif
diff --git a/lib/libpthread/thread/thr_write.c b/lib/libpthread/thread/thr_write.c
index 40c4cc574241..f25c6065b911 100644
--- a/lib/libpthread/thread/thr_write.c
+++ b/lib/libpthread/thread/thr_write.c
@@ -42,7 +42,7 @@
 #include "pthread_private.h"
 
 ssize_t
-write(int fd, const void *buf, size_t nbytes)
+_libc_write(int fd, const void *buf, size_t nbytes)
 {
 	int	blocking;
 	int	type;
@@ -136,4 +136,6 @@ write(int fd, const void *buf, size_t nbytes)
 	_thread_leave_cancellation_point();
 	return (ret);
 }
+
+__weak_reference(_libc_write, write);
 #endif
diff --git a/lib/libpthread/thread/thr_writev.c b/lib/libpthread/thread/thr_writev.c
index 375f59912b6f..74da5219ff92 100644
--- a/lib/libpthread/thread/thr_writev.c
+++ b/lib/libpthread/thread/thr_writev.c
@@ -44,7 +44,7 @@
 #include "pthread_private.h"
 
 ssize_t
-writev(int fd, const struct iovec * iov, int iovcnt)
+_libc_writev(int fd, const struct iovec * iov, int iovcnt)
 {
 	int	blocking;
 	int	idx = 0;
@@ -200,4 +200,6 @@ writev(int fd, const struct iovec * iov, int iovcnt)
 
 	return (ret);
 }
+
+__weak_reference(_libc_writev, writev);
 #endif