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--- a/lib/stdio.in.h
+++ b/lib/stdio.in.h
@@ -138,8 +138,10 @@
/* It is very rare that the developer ever has full control of stdin,
so any use of gets warrants an unconditional warning. Assume it is
always declared, since it is required by C89. */
-#undef gets
+#ifdef gets
+# undef 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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