diff --git a/lang/cem/libcc.ansi/assert/assert.c b/lang/cem/libcc.ansi/assert/assert.c
new file mode 100644
index 000000000..90e4bcd76
--- /dev/null
+++ b/lang/cem/libcc.ansi/assert/assert.c
@@ -0,0 +1,12 @@
+/*
+ * assert.c - diagnostics
+ */
+/* $Header$ */
+
+#include	<stdio.h>
+
+void _bad_assertion(const char *expr, const char *file, int line) {
+
+	fprintf(stderr,"Assertion \"%s\" failed, file \"%s\", line %d\n",
+			expr, file, line);
+}