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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@
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