project('trickier generator', 'cpp') comp = find_program('mygen.py') subdir('subdir') generated2 = custom_target('generated2', output : ['source2.h', 'source2.cpp'], input : 'data2.dat', command : [comp, '@INPUT0@', '@OUTDIR@']) exe = executable('prog', 'main.cpp', generated, generated2, include_directories : include_directories('subdir')) test('generated test', exe)