Index: src/include/utils/fe_ports.h
--- src/include/utils/fe_ports.h.orig
+++ src/include/utils/fe_ports.h
@@ -28,6 +28,7 @@
 #error "This file is not expected to be compiled for pgpool utilities only"
 #endif
 
+#include <stdarg.h>
 #include <stdlib.h>
 #ifndef FE_PORTS
 #define FE_PORTS
