From 8d34674730df97195d0a11c760c35736698b9d7c Mon Sep 17 00:00:00 2001
From: Magnus Jacobsson <Magnus.Jacobsson@berotec.se>
Date: Thu, 22 Jul 2021 15:57:44 +0200
Subject: [PATCH] cgraph: autotools: add definition of export symbols

Fixes errors like this with MinGW:

lib\cgraph/apply.c:48: undefined reference to `__imp_agfstsubg'

Towards https://gitlab.com/graphviz/graphviz/-/issues/2058
---
 lib/cgraph/Makefile.am | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/cgraph/Makefile.am b/lib/cgraph/Makefile.am
index 835315d2c..39e1ff0ca 100644
--- a/lib/cgraph/Makefile.am
+++ b/lib/cgraph/Makefile.am
@@ -7,6 +7,10 @@ pkgconfigdir = $(libdir)/pkgconfig
 
 AM_CPPFLAGS = -I$(top_srcdir)/lib -I$(top_srcdir)/lib/cdt
 
+if WITH_WIN32
+AM_CFLAGS = -DEXPORT_CGRAPH -DEXPORT_AGXBUF -DEXPORT_CGHDR
+endif
+
 pkginclude_HEADERS = cgraph.h
 noinst_HEADERS = agxbuf.h cghdr.h itos.h likely.h prisize_t.h sprint.h \
   strcasecmp.h unreachable.h
-- 
2.40.0