It looks like commit 99fb6e04 (pack-objects: convert to use
parse_options(), 2012-02-01) moved the #ifdef NO_PTHREDS around but
hasn't noticed that the 'arg' variable no longer is available.
Signed-off-by: Michał Kiedrowicz <michal.kiedrowicz@gmail.com> Acked-by: Nguyen Thai Ngoc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>