diff -rupr a/libfcgi/fcgio.cpp b/libfcgi/fcgio.cpp
--- a/libfcgi/fcgio.cpp	2002-02-24 20:12:22.000000000 +0000
+++ b/libfcgi/fcgio.cpp	2016-12-19 07:52:08.208120000 +0000
@@ -23,6 +23,7 @@
 #endif
 
 #include <limits.h>
+#include <cstdio>
 #include "fcgio.h"
 
 using std::streambuf;