diff --git a/include/errno.h b/include/errno.h
index 1c1cbad..e82a39b 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -13,6 +13,20 @@
 #define ENOSYS		0x1BAD0009
 #define EAGAIN		0x1BAD000A
 #define EBUSY		0x1BAD000B
+#define EWOULDBLOCK	0x1BAD000C
+#define EALREADY	0x1BAD000D
+#define EINPROGRESS	0x1BAD000E
+#define ENFILE		0x1BAD000F
+
+#define EAFNOSUPPORT	0x1BAD0020
+#define ENOPROTOOPT	0x1BAD0021
+#define EOPNOTSUPP	0x1BAD0022
+#define EHOSTUNREACH	0x1BAD0023
+#define ECONNABORTED	0x1BAD0024
+#define ECONNRESET	0x1BAD0025
+#define ENOTCONN	0x1BAD0026
+#define ENOBUFS		0x1BAD0027
+#define EADDRINUSE	0x1BAD0028
 
 #endif /* __ERRNO_H__ */
 
diff --git a/include/limits.h b/include/limits.h
new file mode 100644
index 0000000..02f3cc6
--- /dev/null
+++ b/include/limits.h
@@ -0,0 +1,8 @@
+
+#ifndef __LIMITS_H__
+#define __LIMITS_H__
+
+
+
+#endif /* __LIMITS_H__ */
+
diff --git a/include/unistd.h b/include/unistd.h
index 4782b53..e7d895e 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -6,6 +6,8 @@
 #define STDOUT_FILENO		1
 #define STDERR_FILENO		2
 
+struct timeval;
+
 int syscall(int number, ...);
 unsigned int sleep(unsigned int seconds);
 
diff --git a/sys/include/time.h b/sys/include/time.h
new file mode 100644
index 0000000..981b827
--- /dev/null
+++ b/sys/include/time.h
@@ -0,0 +1,8 @@
+
+#ifndef __SYS_TIME_H__
+#define __SYS_TIME_H__
+
+
+
+#endif /* __SYS_TIME_H__ */
+