Use getgrouplist(3) when fetching users groups.
Patch from Debian

Signed-off-by: Jonas Karlsson <jonas@gobolinux.org>
diff -r 08edf44d9f72 -r 4e12baece02e config.h.in
--- a/config.h.in	Wed Apr 12 13:49:40 2006 -0700
+++ b/config.h.in	Wed Apr 12 13:49:51 2006 -0700
@@ -183,3 +183,6 @@
 
 /* Define to 1 if you have F_NOTIFY fcntl */
 #undef USE_DNOTIFY
+
+/* Define to 1 if you have the `getgrouplist' function */
+#undef HAVE_GETGROUPLIST
diff -r 08edf44d9f72 -r 4e12baece02e configure.ac
--- a/configure.ac	Wed Apr 12 13:49:40 2006 -0700
+++ b/configure.ac	Wed Apr 12 13:49:51 2006 -0700
@@ -77,7 +77,7 @@
 # Checks for library functions.
 AC_FUNC_ERROR_AT_LINE
 AC_FUNC_SELECT_ARGTYPES
-AC_CHECK_FUNCS([bindresvport _daemonize daemon getgrmember select])
+AC_CHECK_FUNCS([bindresvport _daemonize daemon getgrmember getgrouplist select])
 
 AC_CONFIG_FILES([Makefile
                  src/Makefile
diff -r 08edf44d9f72 -r 4e12baece02e src/Cred.c++
--- a/src/Cred.c++	Wed Apr 12 13:49:40 2006 -0700
+++ b/src/Cred.c++	Wed Apr 12 13:49:51 2006 -0700
@@ -71,6 +71,13 @@
 			pwd->pw_name, strerror(errno));
             nAddlGroups = 0;
         }
+#elif defined(HAVE_GETGROUPLIST)
+	if (getgrouplist(pwd->pw_name, primary_group, addlGroups, (int *)&nAddlGroups) == -1)
+	{
+	    Log::info("getgrouplist(%s, ...) failed: %s",
+	              pwd->pw_name, strerror(errno));
+	    nAddlGroups = 0;
+	}
 #else
         group *gbp;
         unsigned int ii = 0;