--- ./base/gserrors.h	2017-03-16 09:20:11.000000000 +0000
+++ ./base/gserrors.h	2017-03-18 21:02:46.586737629 +0000
@@ -148,14 +148,14 @@
  *
  */
 
-#ifndef __printflike
+/* Redefine cdefs.h's __printflike function: */
+#undef __printflike
 #if __GNUC__ > 2 || __GNUC__ == 2 && __GNUC_MINOR__ >= 7
 #define __printflike(fmtarg, firstvararg) \
     __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
 #else
 #define __printflike(fmtarg, firstvararg)
 #endif
-#endif
 
 const char *gs_errstr(int code);