--- file-roller-2.30.1.1/src/fr-process.h	2009-04-30 04:47:42.000000000 -0400
+++ foo/src/fr-process.h	2010-05-05 22:05:23.097517483 -0400
@@ -97,7 +97,7 @@
 					     const char   *arg);
 void        fr_process_add_arg_concat       (FrProcess    *fr_proc,
 					     const char   *arg,
-					     ...);
+					     ...) G_GNUC_NULL_TERMINATED;
 void        fr_process_add_arg_printf       (FrProcess    *fr_proc,
 					     const char   *format,
 					     ...) G_GNUC_PRINTF (2, 3);
--- file-roller-2.30.1.1/src/fr-command-tar.c	2010-04-27 02:42:13.000000000 -0400
+++ foo/src/fr-command-tar.c	2010-05-05 22:06:39.920522861 -0400
@@ -661,7 +661,7 @@
 		fr_process_add_arg (comm->process, "-l");
 
 		new_name = g_strconcat (c_tar->uncomp_filename, ".7z", NULL);
-		fr_process_add_arg_concat (comm->process, new_name);
+		fr_process_add_arg_concat (comm->process, new_name, NULL);
 
 		fr_process_add_arg (comm->process, c_tar->uncomp_filename);
 		fr_process_end_command (comm->process);