mainline does not include gzip module?

[ura]

i just replaced a stable install with the mainline version (1.5.8) and
noticed that the outputted files are not being gzipped.
i ran nginx -V and do not see any arguments that enable gzip.
is there a reason why the stable version included gzip and this mainline
does not?
do i need to manually build nginx to include the gzip module?
if so, does that mean i need to rebuild nginx every time there is a new
update?
thanks

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,245997,245997#msg-245997