diff --git a/lang/cem/libcc.ansi/build.lua b/lang/cem/libcc.ansi/build.lua
index 38fba6bb3..3427826e6 100644
--- a/lang/cem/libcc.ansi/build.lua
+++ b/lang/cem/libcc.ansi/build.lua
@@ -44,7 +44,7 @@ for _, plat in ipairs(vars.plats) do
 			"./core/ctype/*.c",
 			"./core/misc/*.c",
 			"./sys/malloc/*.c",
-			"./signal/*.c",
+			"./sys/exit/*.c",
 			"./assert/*.c",
 			"./stdio/*.c",
 			"./stdlib/*.c",
diff --git a/lang/cem/libcc.ansi/stdlib/abort.c b/lang/cem/libcc.ansi/core/misc/abort.c
similarity index 70%
rename from lang/cem/libcc.ansi/stdlib/abort.c
rename to lang/cem/libcc.ansi/core/misc/abort.c
index afad36bf9..d59624169 100644
--- a/lang/cem/libcc.ansi/stdlib/abort.c
+++ b/lang/cem/libcc.ansi/core/misc/abort.c
@@ -4,17 +4,11 @@
  */
 /* $Id$ */
 
-#if defined(_POSIX_SOURCE)
-#include <sys/types.h>
-#endif
-#include <signal.h>
 #include <stdlib.h>
-
-extern void (*_clean)(void);
+#include <sys/types.h>
+#include <signal.h>
 
 void abort(void)
 {
-	if (_clean)
-		_clean(); /* flush all output files */
 	raise(SIGABRT);
 }
diff --git a/lang/cem/libcc.ansi/signal/raise.c b/lang/cem/libcc.ansi/core/misc/raise.c
similarity index 85%
rename from lang/cem/libcc.ansi/signal/raise.c
rename to lang/cem/libcc.ansi/core/misc/raise.c
index e1aedaa01..e50193136 100644
--- a/lang/cem/libcc.ansi/signal/raise.c
+++ b/lang/cem/libcc.ansi/core/misc/raise.c
@@ -4,14 +4,17 @@
  */
 /* $Id$ */
 
-#if defined(_POSIX_SOURCE)
+#include <stdlib.h>
 #include <sys/types.h>
-#endif
 #include <signal.h>
 
+#if ACKCONF_WANT_EMULATED_RAISE
+
 int raise(int sig)
 {
 	if (sig < 0 || sig > _NSIG)
 		return -1;
 	return kill(getpid(), sig);
 }
+
+#endif
diff --git a/lang/cem/libcc.ansi/headers/ack/config.h b/lang/cem/libcc.ansi/headers/ack/config.h
index ae397dbfe..593767d4c 100644
--- a/lang/cem/libcc.ansi/headers/ack/config.h
+++ b/lang/cem/libcc.ansi/headers/ack/config.h
@@ -24,4 +24,14 @@
 #define ACKCONF_WANT_TERMIOS 0
 #endif
 
+#ifndef ACKCONF_WANT_EMULATED_RAISE
+/* Implement raise() in terms of kill() and getpid(). */
+#define ACKCONF_WANT_EMULATED_RAISE 1
+#endif
+
+#ifndef ACKCONF_WANT_MALLOC
+/* Uses sbrk() to get memory from the system. */
+#define ACKCONF_WANT_MALLOC 1
+#endif
+
 #endif
diff --git a/lang/cem/libcc.ansi/signal/LIST b/lang/cem/libcc.ansi/signal/LIST
deleted file mode 100644
index ff77f128d..000000000
--- a/lang/cem/libcc.ansi/signal/LIST
+++ /dev/null
@@ -1 +0,0 @@
-raise.c
diff --git a/lang/cem/libcc.ansi/signal/Makefile b/lang/cem/libcc.ansi/signal/Makefile
deleted file mode 100644
index c9578ae90..000000000
--- a/lang/cem/libcc.ansi/signal/Makefile
+++ /dev/null
@@ -1,2 +0,0 @@
-clean:
-	rm -f raise.o OLIST
diff --git a/lang/cem/libcc.ansi/stdio/fflush.c b/lang/cem/libcc.ansi/stdio/fflush.c
index f5ef6c355..24baa6e70 100644
--- a/lang/cem/libcc.ansi/stdio/fflush.c
+++ b/lang/cem/libcc.ansi/stdio/fflush.c
@@ -68,7 +68,7 @@ int fflush(FILE* stream)
 	return EOF;
 }
 
-void __cleanup(void)
+static void cleanup(void)
 {
 	register int i;
 
@@ -76,3 +76,13 @@ void __cleanup(void)
 		if (__iotab[i] && io_testflag(__iotab[i], _IOWRITING))
 			(void)fflush(__iotab[i]);
 }
+
+void __register_stdio_cleanup(void)
+{
+	static char registered = 0;
+	if (!registered)
+	{
+		registered = 1;
+		atexit(cleanup);
+	}
+}
diff --git a/lang/cem/libcc.ansi/stdio/flushbuf.c b/lang/cem/libcc.ansi/stdio/flushbuf.c
index 9518de70d..976d82a89 100644
--- a/lang/cem/libcc.ansi/stdio/flushbuf.c
+++ b/lang/cem/libcc.ansi/stdio/flushbuf.c
@@ -8,8 +8,6 @@
 #include <unistd.h>
 #include "loc_incl.h"
 
-extern void (*_clean)(void);
-
 static int
 do_write(int d, char* buf, int nbytes)
 {
@@ -28,7 +26,7 @@ do_write(int d, char* buf, int nbytes)
 
 int __flushbuf(int c, FILE* stream)
 {
-	_clean = __cleanup;
+	__register_stdio_cleanup();
 	if (fileno(stream) < 0)
 		return EOF;
 	if (!io_testflag(stream, _IOWRITE))
diff --git a/lang/cem/libcc.ansi/stdio/loc_incl.h b/lang/cem/libcc.ansi/stdio/loc_incl.h
index 52488e0c9..b30d3272a 100644
--- a/lang/cem/libcc.ansi/stdio/loc_incl.h
+++ b/lang/cem/libcc.ansi/stdio/loc_incl.h
@@ -14,7 +14,8 @@ int _doprnt(const char *format, va_list ap, FILE *stream);
 int _doscan(FILE * stream, const char *format, va_list ap);
 char *_i_compute(unsigned long val, int base, char *s, int nrdigits);
 char *_f_print(va_list *ap, int flags, char *s, char c, int precision);
-void __cleanup(void);
+
+extern void __register_stdio_cleanup(void);
 
 FILE *popen(const char *command, const char *type);
 FILE *fdopen(int fd, const char *mode);
diff --git a/lang/cem/libcc.ansi/stdio/setvbuf.c b/lang/cem/libcc.ansi/stdio/setvbuf.c
index b7571ccc6..4650db03d 100644
--- a/lang/cem/libcc.ansi/stdio/setvbuf.c
+++ b/lang/cem/libcc.ansi/stdio/setvbuf.c
@@ -13,7 +13,7 @@ int setvbuf(register FILE* stream, char* buf, int mode, size_t size)
 {
 	int retval = 0;
 
-	_clean = __cleanup;
+	__register_stdio_cleanup();
 	if (mode != _IOFBF && mode != _IOLBF && mode != _IONBF)
 		return EOF;
 
diff --git a/lang/cem/libcc.ansi/stdlib/atexit.c b/lang/cem/libcc.ansi/sys/exit/atexit.c
similarity index 64%
rename from lang/cem/libcc.ansi/stdlib/atexit.c
rename to lang/cem/libcc.ansi/sys/exit/atexit.c
index c9dc7964a..2cb16da9f 100644
--- a/lang/cem/libcc.ansi/stdlib/atexit.c
+++ b/lang/cem/libcc.ansi/sys/exit/atexit.c
@@ -1,11 +1,7 @@
 /* $Id$ */
 
 #include <stdlib.h>
-
-#define NEXITS 32
-
-extern void (*__functab[NEXITS])(void);
-extern int __funccnt;
+#include "atexits.h"
 
 int atexit(void (*func)(void))
 {
diff --git a/lang/cem/libcc.ansi/sys/exit/atexits.h b/lang/cem/libcc.ansi/sys/exit/atexits.h
new file mode 100644
index 000000000..3cca599c5
--- /dev/null
+++ b/lang/cem/libcc.ansi/sys/exit/atexits.h
@@ -0,0 +1,9 @@
+#ifndef ATEXITS_H
+#define ATEXITS_H
+
+#define NEXITS 32
+
+extern void (*__functab[NEXITS])(void);
+extern int __funccnt;
+
+#endif
diff --git a/lang/cem/libcc.ansi/stdlib/exit.c b/lang/cem/libcc.ansi/sys/exit/exit.c
similarity index 62%
rename from lang/cem/libcc.ansi/stdlib/exit.c
rename to lang/cem/libcc.ansi/sys/exit/exit.c
index ef8976bc0..7f861321f 100644
--- a/lang/cem/libcc.ansi/stdlib/exit.c
+++ b/lang/cem/libcc.ansi/sys/exit/exit.c
@@ -7,29 +7,16 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
-
-#define NEXITS 32
+#include "atexits.h"
 
 void (*__functab[NEXITS])(void);
 int __funccnt = 0;
 
-/* only flush output buffers when necessary */
-int (*_clean)(void) = NULL;
-
-static void
-_calls(void)
-{
-	register int i = __funccnt;
-
-	/* "Called in reversed order of their registration" */
-	while (--i >= 0)
-		(*__functab[i])();
-}
-
 void exit(int status)
 {
-	_calls();
-	if (_clean)
-		_clean();
+	/* "Called in reversed order of their registration" */
+	while (__funccnt >= 0)
+		(*__functab[__funccnt])();
+
 	_exit(status);
 }