diff --git a/lang/cem/libcc.ansi/signal/raise.c b/lang/cem/libcc.ansi/signal/raise.c
index 484764bde..6309dfe46 100644
--- a/lang/cem/libcc.ansi/signal/raise.c
+++ b/lang/cem/libcc.ansi/signal/raise.c
@@ -4,6 +4,9 @@
  */
 /* $Header$ */
 
+#if	defined(_POSIX_SOURCE)
+#include	<sys/types.h>
+#endif
 #include	<signal.h>
 
 int _kill(int pid, int sig);
diff --git a/lang/cem/libcc.ansi/stdlib/abort.c b/lang/cem/libcc.ansi/stdlib/abort.c
index db9dcaebd..4ace48a6c 100644
--- a/lang/cem/libcc.ansi/stdlib/abort.c
+++ b/lang/cem/libcc.ansi/stdlib/abort.c
@@ -4,6 +4,9 @@
  */
 /* $Header$ */
 
+#if	defined(_POSIX_SOURCE)
+#include	<sys/types.h>
+#endif
 #include	<signal.h>
 #include	<stdlib.h>
 
diff --git a/lang/cem/libcc.ansi/stdlib/system.c b/lang/cem/libcc.ansi/stdlib/system.c
index 9a786f682..ae8c1a754 100644
--- a/lang/cem/libcc.ansi/stdlib/system.c
+++ b/lang/cem/libcc.ansi/stdlib/system.c
@@ -4,6 +4,9 @@
  */
 /* $Header$ */
 
+#if	defined(_POSIX_SOURCE)
+#include	<sys/types.h>
+#endif
 #include	<stdlib.h>
 #include	<signal.h>