To get rid of those pesky libxcb locking error messages force libX11 back to an earlier version !!
From console execute ....
# rpm -U --nodeps --force libX11-1.0.3-8.fc7.x86_64.rpm
Now my Catalyst 8.8 / SDK 1.2 compiles OK !
We have not tested Fedora in house, so I am glad you have posted the steps to get it running.