Enable pkg-config-driven pycairo cflags
#235
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Allow pkg-config to detect flags for either: - `py3cairo`, or - `pycairo` The previous method of always using `sys.exec_prefix` to locate pycairo headers is insufficient on systems where Python and pycairo have different install prefixes (e.g. `/usr` vs. `/usr/local`). For backward compatibility, the previous method is still the default behavior when `pkg-config` cannot detect appropriate flags at runtime. Resolves issue mapnik#234
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Allow pkg-config to detect flags for either:
py3cairo, orpycairoThe previous method of always using
sys.exec_prefixto locate pycairoheaders is insufficient on systems where Python and pycairo have
different install prefixes (e.g.
/usrvs./usr/local).For backward compatibility, the previous method is still the default
behavior when
pkg-configcannot detect appropriate flags at runtime.Resolves issue #234