diff --git a/lib/libauditd/Makefile b/lib/libauditd/Makefile
index 2df9fa8fb0ea..c29c32ceb12b 100644
--- a/lib/libauditd/Makefile
+++ b/lib/libauditd/Makefile
@@ -23,3 +23,10 @@ WARNS?=		3
 MAN=
 
 .include <bsd.lib.mk>
+
+# Disable -Wcast-align.  Casting res->ai_addr in auditd_set_host triggers this
+# warning, but it's ok because res->ai_addr must've originally pointed to a
+# sockaddr_in or sockaddr_in6 anyway.
+# Better would be to disable this warning in just that one function, but GCC
+# 4.2 can't do that :( .
+CWARNFLAGS.auditd_lib.c+=	-Wno-cast-align
diff --git a/lib/libbsm/Makefile b/lib/libbsm/Makefile
index 0a4b49845413..9b71967d46ba 100644
--- a/lib/libbsm/Makefile
+++ b/lib/libbsm/Makefile
@@ -181,3 +181,10 @@ MLINKS=	libbsm.3 bsm.3							\
 	setaudit.2 setaudit_addr.2
 
 .include <bsd.lib.mk>
+
+# Disable -Wcast-align.  Casting sa_local in au_to_socket_ex triggers this
+# warning, but it's ok because sa_local must've originally pointed to a
+# sockaddr_in or sockaddr_in6 anyway.
+# Better would be to disable this warning in just that one function, but GCC
+# 4.2 can't do that :( .
+CWARNFLAGS.bsm_token.c+=	-Wno-cast-align