Install this package:
emerge -a dev-php/PHP_CodeSniffer
If the package is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask
emerge
autounmask dev-php/PHP_CodeSniffer
Or alternatively:
emerge --autounmask-write -a dev-php/PHP_CodeSniffer
<pkgmetadata> <maintainer type="person" proxied="yes"> <email>web@inode64.com</email> <name>Fco. Javier Félix</name> </maintainer> <maintainer type="project" proxied="proxy"> <email>proxy-maint@gentoo.org</email> <name>Proxy Maintainers</name> </maintainer> <upstream> <remote-id type="github">PHPCSStandards/PHP_CodeSniffer</remote-id> </upstream> </pkgmetadata>