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diff --git a/configure.ac b/configure.ac
index 4bb9380..38e2cf6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -133,7 +134,11 @@ AC_CHECK_LIB(socket, connect)
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
AC_CACHE_CHECK([if libc defines __progname], ac_cv_libc_defines___progname, [
AC_TRY_LINK([],
- [ extern char *__progname; printf("%s", __progname); ],
+ [
+ #include <stdio.h>;
+ extern char *__progname;
+ printf("%s", __progname);
+ ],
[ ac_cv_libc_defines___progname="yes" ],
[ ac_cv_libc_defines___progname="no" ]
)
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