doxygen = find_program('doxygen') cpp_doxygen_input = [] foreach h : c_headers + cpp_headers cpp_doxygen_input += ['..' / h] endforeach config = configuration_data() config.set('PUGL_HEADERS', ' '.join(cpp_doxygen_input)) config.set('PUGL_SRCDIR', pugl_src_root) cpp_doxyfile = configure_file(configuration: config, input: '../Doxyfile.in', output: 'Doxyfile') cpp_index_xml = custom_target( 'cpp-index.xml', command: [doxygen, '@INPUT0@'], input: [cpp_doxyfile] + c_header_files + cpp_header_files, output: 'index.xml')