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https://sourceforge.net/p/mjpeg/bugs/144/
https://bugs.gentoo.org/899868
--- a/configure.ac
+++ b/configure.ac
@@ -236,7 +236,7 @@ dnl Check to see if __progname is provided by the system
dnl ********************************************************************
AC_CACHE_CHECK([for __progname],
[mjt_cv_extern___progname],
- [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],
+ [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
[[extern char *__progname;
puts(__progname);]])],
[mjt_cv_extern___progname=yes],
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