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9a7c01a8aa
... if Cairo was requested (OPTION_CAIRO or OPTION_CAIROEXT) but
Cairo was not found. CMake generation is terminated with a fatal error.
The user has two choices: install Cairo libs and headers or disable
OPTION_CAIRO and OPTION_CAIROEXT.
Note: back-ported (cherry-picked) from 1.4.0 (master): 88129db051