--- ircservices-5.1.24.orig/configure
+++ ircservices-5.1.24/configure
@@ -855,6 +855,7 @@
 
 log "test vararg macros..."
 cat >$CONFTMP/test.c <<EOT
+#include <stdio.h>
 #define foo(a,...) int a() {printf("hello %s\n" , ##__VA_ARGS__); return 69;}
 foo(main,"world")
 EOT