If --enable-cairo is provided, ensure that we a...
If --enable-cairo is provided, ensure that we a...

If --enable-cairo is provided, ensure that we actually get CAIRO support.
If we don't, then abort and let a human figure it out.

(inspired from r3546)

This commit was SVN r3557.

The following SVN revision numbers were found above:
  r3546 --> 56168dd3f8b683314f319bc1088af8abf2578240

ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc