diff -up m4-1.4.16/lib/stdio.in.h.orig m4-1.4.16/lib/stdio.in.h
--- m4-1.4.16/lib/stdio.in.h.orig	2012-05-30 13:55:51.092600199 +0200
+++ m4-1.4.16/lib/stdio.in.h	2012-05-30 13:56:25.763794100 +0200
@@ -162,7 +162,9 @@ _GL_WARN_ON_USE (fflush, "fflush is not
    so any use of gets warrants an unconditional warning.  Assume it is
    always declared, since it is required by C89.  */
 #undef gets
+#if HAVE_RAW_DECL_GETS
 _GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
+#endif
 
 #if @GNULIB_FOPEN@
 # if @REPLACE_FOPEN@