Man pages matching name crypt::unixcrypt_xs in section 3pm:

Crypt::UnixCrypt_XS.3pm.en	debian 10 / libcrypt-unixcrypt-xs-perl
Crypt::UnixCrypt_XS.3pm.en	debian 11 / libcrypt-unixcrypt-xs-perl
Crypt::UnixCrypt_XS.3pm.en	debian 12 / libcrypt-unixcrypt-xs-perl