diff --git a/lang/cem/libcc.ansi/signal/raise.c b/lang/cem/libcc.ansi/signal/raise.c
index f426ab1ab..484764bde 100644
--- a/lang/cem/libcc.ansi/signal/raise.c
+++ b/lang/cem/libcc.ansi/signal/raise.c
@@ -6,13 +6,13 @@
 
 #include	<signal.h>
 
-int kill(int pid, int sig);
-int getpid(void);
+int _kill(int pid, int sig);
+int _getpid(void);
 
 int
 raise(int sig)
 {
 	if (sig < 0 || sig > _NSIG)
 		return -1;
-	return kill(getpid(), sig);
+	return _kill(_getpid(), sig);
 }
diff --git a/lang/cem/libcc.ansi/stdlib/abort.c b/lang/cem/libcc.ansi/stdlib/abort.c
index d2fc9d39a..db9dcaebd 100644
--- a/lang/cem/libcc.ansi/stdlib/abort.c
+++ b/lang/cem/libcc.ansi/stdlib/abort.c
@@ -7,9 +7,12 @@
 #include	<signal.h>
 #include	<stdlib.h>
 
+extern void (*_clean)(void);
+
 void
 abort(void)
 {
+	if (_clean) _clean();		/* flush all output files */
 	raise(SIGABRT);
 }
 
diff --git a/lang/cem/libcc.ansi/stdlib/exit.c b/lang/cem/libcc.ansi/stdlib/exit.c
index fb7f97cb0..353413f05 100644
--- a/lang/cem/libcc.ansi/stdlib/exit.c
+++ b/lang/cem/libcc.ansi/stdlib/exit.c
@@ -13,8 +13,9 @@ void (*__functab[NEXITS])(void);
 int __funccnt = 0;
 
 extern void _exit(int);
-/* only fflush when there is output */
-int (*_fflush)(FILE *stream) = NULL;
+
+/* only flush output buffers when necessary */
+int (*_clean)(void) = NULL;
 
 static void
 _calls(void)
@@ -30,6 +31,6 @@ void
 exit(int status)
 {
 	_calls();
-	if (_fflush) _fflush((FILE *)NULL) ;
+	if (_clean) _clean();
 	_exit(status) ;
 }
diff --git a/lang/cem/libcc.ansi/stdlib/system.c b/lang/cem/libcc.ansi/stdlib/system.c
index afe38aa87..09d38cb91 100644
--- a/lang/cem/libcc.ansi/stdlib/system.c
+++ b/lang/cem/libcc.ansi/stdlib/system.c
@@ -7,11 +7,11 @@
 #include	<stdlib.h>
 #include	<signal.h>
 
-extern int fork(void);
-extern int wait(int *);
+extern int _fork(void);
+extern int _wait(int *);
 extern void _exit(int);
-extern void execl(char *, ...);
-extern void close(int);
+extern void _execl(char *, ...);
+extern void _close(int);
 
 #define	FAIL	127
 
@@ -21,17 +21,17 @@ system(const char *str)
 	int pid, exitstatus, waitval;
 	int i;
 
-	if ((pid = fork()) < 0) return str ? -1 : 0;
+	if ((pid = _fork()) < 0) return str ? -1 : 0;
 
 	if (pid == 0) {
 		for (i = 3; i <= 20; i++)
-			close(i);
+			_close(i);
 		if (!str) str = "cd .";		/* just testing for a shell */
-		execl("/bin/sh", "sh", "-c", str, (char *) NULL);
+		_execl("/bin/sh", "sh", "-c", str, (char *) NULL);
 		/* get here if execl fails ... */
 		_exit(FAIL);	/* see manual page */
 	}
-	while ((waitval = wait(&exitstatus)) != pid) {
+	while ((waitval = _wait(&exitstatus)) != pid) {
 		if (waitval == -1) break;
 	}
 	if (waitval == -1) {