option('checkasm', type: 'feature', value: 'auto', description: 'Build the checkasm test tool')
option('avisynth', type: 'boolean', value: false, description: 'Build the AviSynth+ plugin frontend')
option('avisynth_lib_dir', type: 'string', value: '', description: 'Directory holding libavisynth.so.N; set to build the AviSynth+ end-to-end test (test/test_interlace_avs.c). Run it by hand.')
