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--- a/acinclude.m4
+++ b/acinclude.m4
@@ -9,8 +9,9 @@ changequote([, ])dnl
AC_MSG_CHECKING(size of $1)
AC_CACHE_VAL(AC_CV_NAME,
[AC_TRY_RUN([#include <stdio.h>
+#include <stdlib.h>
#include <$2>
-main()
+int main(void)
{
FILE *f=fopen("conftestval", "w");
if (!f) exit(1);
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