This handles the case where the user running the test suite doesn't have any
supplementary groups. (I think user.c could use an overhaul; foreign_group
crashes if get_group_list returns NULL, and the "not a member of any groups?"
logic looks backwards to me.)

diff -x config.log -x config.status -ru tmp/CSSC-1.3.0/testutils/user.c work/CSSC-1.3.0/testutils/user.c
--- tmp/CSSC-1.3.0/testutils/user.c	2010-05-16 18:31:33.000000000 +0100
+++ work/CSSC-1.3.0/testutils/user.c	2010-11-09 10:32:21.000000000 +0000
@@ -70,7 +70,7 @@
            * and return a list with it included, but only once
            */
           gid_t egid = getegid();
-          if (getgroups(len, &grouplist[1]))
+          if (getgroups(len, &grouplist[1]) >= 0)
             {
               if (duplicate_group(egid, grouplist+1, len))
                 {