project('outputs not matching install_dirs', 'c') gen = find_program('generator.py') if meson.backend() != 'ninja' error('Failing manually, test is only for the ninja backend') endif custom_target('too-few-install-dirs', output : ['toofew.h', 'toofew.c', 'toofew.sh'], command : [gen, 'toofew', '@OUTDIR@'], install : true, install_dir : [join_paths(get_option('prefix'), get_option('includedir')), false])