--- misc/build/raptor2-2.0.15/configure	2014-11-02 01:04:38.000000000 -0500
+++ misc/build/raptor2-2.0.15/configure	2021-07-08 14:26:15.000000000 -0400
@@ -13747,6 +13747,7 @@
 $as_echo_n "checking whether __FUNCTION__ is available... " >&6; }
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
+#include <stdio.h>
 int main() { printf(__FUNCTION__); }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :