make sure autoconf tests have been run

diff --git a/lib/xmalloc.c b/lib/xmalloc.c
index e204ae4..d2996a0 100644 (file)
--- a/lib/xmalloc.c
+++ b/lib/xmalloc.c
@@ -54,6 +54,13 @@ void *xcalloc (size_t n, size_t s);
 void *xrealloc (void *p, size_t n);
 #endif
 
+#ifndef HAVE_DONE_WORKING_MALLOC_CHECK
+you must run the autoconf test for a properly working malloc -- see malloc.m4
+#endif
+
+#ifndef HAVE_DONE_WORKING_REALLOC_CHECK
+you must run the autoconf test for a properly working realloc -- see realloc.m4
+#endif
 
 /* Exit value when the requested amount of memory is not available.
    The caller may set it to some other value.  */