Man pages matching name posix_memalign in section 3:

posix_memalign.3.en	debian 10 / manpages-dev
posix_memalign.3.es	debian 10 / manpages-es
posix_memalign.3.ja	debian 10 / manpages-ja-dev
posix_memalign.3.en	debian 11 / manpages-dev
posix_memalign.3.fr	debian 11 / manpages-fr-dev
posix_memalign.3.ja	debian 11 / manpages-ja-dev
posix_memalign.3.en	debian 12 / manpages-dev
posix_memalign.3.fr	debian 12 / manpages-fr-dev
posix_memalign.3.ja	debian 12 / manpages-ja-dev