Man pages matching name feature_test_macros in section 7:

feature_test_macros.7.en	debian 10 / manpages
feature_test_macros.7.de	debian 10 / manpages-de
feature_test_macros.7.ja	debian 10 / manpages-ja
feature_test_macros.7.en	debian 11 / manpages
feature_test_macros.7.de	debian 11 / manpages-de
feature_test_macros.7.ja	debian 11 / manpages-ja
feature_test_macros.7.en	debian 12 / manpages
feature_test_macros.7.de	debian 12 / manpages-de
feature_test_macros.7.fr	debian 12 / manpages-fr
feature_test_macros.7.ja	debian 12 / manpages-ja
feature_test_macros.7.ru	debian 12 / manpages-ru