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- don't use pkg-config to find Cairo if FLTK_CAIRO_DIR is set - use FLTK_CAIRO_DIR to locate Cairo headers and DLL if it is set - otherwise try to find Cairo with pkg-config anyway This prevents accidentally "finding" the system Cairo libs provided by MSYS - which would tie the FLTK library and user programs to MSYS, i.e. it would make FLTK programs depend on the MSYS installation.