--- gvpe/src/slog.h	2003/10/16 02:41:21	1.4
+++ gvpe/src/slog.h	2004/01/29 18:55:10	1.5
@@ -74,6 +74,9 @@
 #endif
 
 extern void fatal (const char *m);
+extern void require_failed (const char *file, int line, const char *info);
+
+#define require(expr) if (!(expr)) require_failed (__FILE__,  __LINE__, #expr)
 
 #endif