12d4e7567c
Fully enable pycairo support by exporting PYCAIRO=true and using pkg-config to locate the pycairo library (with included patch). The patch restores the use of pkg-config to find pycairo. This code was present upstream, but commented out; it has been re-enabled and modified to support both pycairo and py3cairo (the python3 version of pycairo).