cgraph: include config.h in agxbuf.h to get GVDLL in autotools builds

An upcoming commit which changes agxbuf.h to use GVDLL to control the
storage-class attribute declarations would otherwise cause errors like
this:

C:\Users\magja\graphviz\lib\gvc/gvplugin.c:386: undefined reference to `__imp_agxbprint'

Towards https://gitlab.com/graphviz/graphviz/-/issues/2173.

diff --git a/lib/cgraph/agxbuf.h b/lib/cgraph/agxbuf.h
index e1549caae61d9c28ecc6ab52f4026be8808ed802..480857e3932c84cbba586e33de5eb38792f255b7 100644 (file)
--- a/lib/cgraph/agxbuf.h
+++ b/lib/cgraph/agxbuf.h
@@ -16,6 +16,8 @@ extern "C" {
 
 #include <stddef.h>
 
+#include "config.h"
+
 #ifdef _WIN32
 #   ifdef EXPORT_AGXBUF
 #       define AGXBUF_API __declspec(dllexport)