$OpenBSD: patch-makefile_ver,v 1.1.1.1 2009/10/15 14:38:06 phessler Exp $
--- makefile.ver.orig	Sun Jul 22 10:32:32 2007
+++ makefile.ver	Thu Oct 15 13:12:42 2009
@@ -3,8 +3,8 @@
 LIBRARY_VERSION = 42
 
 # Shared library versions for Unix
-shared_version = 4.2.3
-shared_major_minor = 4.2
+shared_version ?= 4.2.3
+shared_major_minor ?= 4.2
 
 # Compatibility version for Mac OS X
 compatibility_version = 4.2.0