Code drop from //branches/cupcake/...@124589
diff --git a/libc/include/grp.h b/libc/include/grp.h
index 4efc2bd..86d99f3 100644
--- a/libc/include/grp.h
+++ b/libc/include/grp.h
@@ -74,6 +74,9 @@
 
 int   getgrouplist (const char *user, gid_t group,
                   gid_t *groups, int *ngroups);
+
+int   initgroups (const char *user, gid_t group);
+
 __END_DECLS
 
 #endif /* !_GRP_H_ */