Author: Daniel Baumann <daniel.baumann@progress-linux.org>
Description: Setting theme to "System".

diff -Naurp gimp.orig/etc/gimprc.in gimp/etc/gimprc.in
--- gimp.orig/etc/gimprc.in
+++ gimp/etc/gimprc.in
@@ -798,7 +798,7 @@
 
 # The name of the theme to use.  This is a string value.
 # 
-# (theme "Dark")
+(theme "System")
 
 # Sets the icon theme search path.  This is a colon-separated list of folders
 # to search.