@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.77 2020/06/05 12:49:17 jperkin Exp $
+# $NetBSD: Makefile,v 1.78 2020/09/21 03:43:22 mef Exp $
 
 DISTNAME=	gnustep-gui-0.22.0
 PKGREVISION=	23
@@ -14,6 +14,21 @@
 GNU_CONFIGURE=		yes
 CONFIGURE_ARGS+=	--exec-prefix=${PREFIX}/libexec/GNUstep
 MAKE_FILE=		GNUmakefile
+
+# problem:
+# | In file included from ../Headers/AppKit/AppKit.h:117:
+# | ../Headers/AppKit/NSWorkspace.h:169:14: error: redefinition of 'NSAppleEventDescriptor' as different kind of symbol
+# | typedef void NSAppleEventDescriptor;
+# |              ^
+# | /tmp/x11/gnustep-gui/work/.buildlink/include/Foundation/NSAppleEventDescriptor.h:36:12: note: previous definition is here
+# | @interface NSAppleEventDescriptor : NSObjec
+
+# hint: https://www.mail-archive.com/gnustep-cvs@gna.org/msg17908.html
+SUBST_CLASSES+=	gs
+SUBST_FILES.gs=	Source/NSAnimation.m
+SUBST_STAGE.gs=	pre-configure
+SUBST_SED.gs=	-e 's/GS_GC_UNHIDE//'
+SUBST_SED.gs+=	-e 's/GS_GC_HIDE//'
 
 INSTALLATION_DIRS+=	share/GNUstep/Applications