diff -ur libgd-2.2.5.orig/src/gd.h libgd-2.2.5/src/gd.h
--- libgd-2.2.5.orig/src/gd.h	Wed Aug 30 20:05:54 2017
+++ libgd-2.2.5/src/gd.h	Thu Aug 31 07:36:57 2017
@@ -63,7 +63,7 @@
 #   define BGD_EXPORT_DATA_PROT __declspec(dllimport)
 #  endif
 # endif
-# define BGD_STDCALL __stdcall
+# define BGD_STDCALL
 # define BGD_EXPORT_DATA_IMPL
 #else
 # if defined(__GNUC__) || defined(__clang__)
