/usr/share/php/pkgtools/ is in pkg-php-tools 1.35ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/pkgtools/base/
/usr/share/php/pkgtools/base/command.php
/usr/share/php/pkgtools/base/dependencies.php
/usr/share/php/pkgtools/base/dependency.php
/usr/share/php/pkgtools/base/logger.php
/usr/share/php/pkgtools/base/override.php
/usr/share/php/pkgtools/base/overrides.php
/usr/share/php/pkgtools/base/utils.php
/usr/share/php/pkgtools/command.php
/usr/share/php/pkgtools/phpcomposer/
/usr/share/php/pkgtools/phpcomposer/command.php
/usr/share/php/pkgtools/phpcomposer/source.php
/usr/share/php/pkgtools/phppear/
/usr/share/php/pkgtools/phppear/command.php
/usr/share/php/pkgtools/phppear/source.php
/usr/share/php/pkgtools/phppearchannel/
/usr/share/php/pkgtools/phppearchannel/command.php
/usr/share/php/pkgtools/phppearchannel/source.php