Index: build/getversion.py
===================================================================
--- build/getversion.py	(revision 26949)
+++ build/getversion.py	(working copy)
@@ -42,8 +42,13 @@
   p.search('SVN_VER_MINOR', 'minor')
   p.search('SVN_VER_PATCH', 'patch')
 
-  import os, sys
-  r = p.parse(sys.argv[1])
+  import sys
+  if len(sys.argv) == 2:
+    include_file = sys.argv[1]
+  else:
+    include_file = '../subversion/include/svn_version.h'
+
+  r = p.parse(include_file)
   sys.stdout.write("%d.%d.%d" % (r.major, r.minor, r.patch))