Man pages matching name extutils::pkgconfig in section 3pm:

ExtUtils::PkgConfig.3pm.en	debian 10 / libextutils-pkgconfig-perl
ExtUtils::PkgConfig.3pm.en	debian 11 / libextutils-pkgconfig-perl
ExtUtils::PkgConfig.3pm.en	debian 12 / libextutils-pkgconfig-perl