--- a/prefix-portage-2.2.01.15553/pym/portage/data.py	2010-07-14 17:55:27.000000000 +0100
+++ a/prefix-portage-2.2.01.15553/pym/portage/data.py	2010-11-05 18:33:39.000000000 +0000
@@ -3,7 +3,7 @@ 
 # Distributed under the terms of the GNU General Public License v2
 
 import os, sys, pwd, grp, platform
-from portage.const import PORTAGE_GROUPNAME, PORTAGE_USERNAME, rootuid, EPREFIX
+from portage.const import * 
 
 import portage
 portage.proxy.lazyimport.lazyimport(globals(),
@@ -85,7 +85,10 @@ 
 #Discover the uid and gid of the portage user/group
 try:
 	portage_uid = pwd.getpwnam(_portage_uname)[2]
-	portage_gid = grp.getgrnam(_portage_grpname)[2]
+	if _portage_grpname.isdigit():
+		portage_gid = int(_portage_grpname)
+	else:
+		portage_gid = grp.getgrnam(_portage_grpname)[2]
 	if secpass < 1 and portage_gid in os.getgroups():
 		secpass=1
 except KeyError: