Index: Makefile
===================================================================
RCS file: /cvs/ports/cad/gerbv/Makefile,v
retrieving revision 1.39
diff -u -p -r1.39 Makefile
--- Makefile	16 Nov 2020 20:34:39 -0000	1.39
+++ Makefile	29 Jan 2021 20:51:48 -0000
@@ -2,6 +2,7 @@
 
 COMMENT=		viewer for Gerber (RS-274X) files
 DISTNAME=		gerbv-2.7.0
+REVISION=		0
 CATEGORIES=		cad graphics
 
 HOMEPAGE=		http://gerbv.geda-project.org/
Index: patches/patch-src_callbacks_h
===================================================================
RCS file: patches/patch-src_callbacks_h
diff -N patches/patch-src_callbacks_h
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-src_callbacks_h	29 Jan 2021 20:51:48 -0000
@@ -0,0 +1,25 @@
+$OpenBSD$
+
+From https://sources.debian.org/patches/gerbv/2.7.0-2/fixes/gcc10-extern.patch/
+
+Index: src/callbacks.h
+--- src/callbacks.h.orig
++++ src/callbacks.h
+@@ -26,7 +26,7 @@
+     \ingroup gerbv
+ */
+ 
+-enum {
++extern enum {
+ 	CALLBACKS_SAVE_PROJECT_AS,
+ 	CALLBACKS_SAVE_FILE_PS,
+ 	CALLBACKS_SAVE_FILE_PDF,
+@@ -43,7 +43,7 @@ enum {
+ 	
+ } CALLBACKS_SAVE_FILE_TYPE;
+ 
+-enum {
++extern enum {
+ 	LAYER_SELECTED =	-1,
+ 	LAYER_ALL_ON =		-2,
+ 	LAYER_ALL_OFF =		-3,