* Make sure that the X server can write the compiled xkb keymap. This

  requires $out/share/X11/xkb/compiled to be writable, so symlink it
  to /var/tmp.  Using --with-xkb-output doesn't work in a chroot build
  because `make install' tries to write a README.compiled file to
  /var/tmp, which doesn't exist in the chroot.

svn path=/nixpkgs/trunk/; revision=17000