Comment 22 for bug 87390

this upload should fix this, if not please reopen:

libxcb (1.0-1.1ubuntu1) feisty; urgency=low
 .
   [ Timo Aaltonen ]
   * debian/patches:
     - 100_allow_sloppy_lock.diff from Novell, workaround to the various
       'Assertion `c->xlib.lock' failed"' -bugs by setting an environment
       variable LIBXCB_ALLOW_SLOPPY_LOCK to any value and the check will
       simply be ignored.
   * debian/{control,rules}:
     - add quilt to Build-deps, and patchsys-quilt.mk to rules.
     - change Maintainer address.
 .
    [ Martin Pitt ]
    * 100_allow_sloppy_lock.diff: Reverse the patch logic for Feisty: Use
      sloppy locking by default for now, because we won't have time to discover
      and fix all broken apps. Setting LIBXCB_NO_SLOPPY_LOCK will enable the
      strict behaviour. This should be dropped right at the opening of
      Feisty+1.