/usr
$ head /var/log/emerge.log
1309433336: Started emerge on: Jun 30, 2011 11:28:56
1309433336: *** emerge unmerge dev-util/ccache
1309433336: *** exiting successfully.
1309433336: *** terminating.
1309995063: Started emerge on: Jul 06, 2011 23:31:03
1309995063: *** emerge sync
1309995063: === sync
1309995063: >>> Starting rsync with rsync://134.68.240.59/gentoo-portage
1309995119: === Sync completed with rsync://134.68.240.59/gentoo-portage
1309995119: *** terminating.
cmake
is enough , unless you are using something very specific of qmake
or there is no config for cmake