A unified PostgreSQL driver for PDO Formula was removed
Last version was
php54-pdo-pgsql requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
postgresql 10.3 Object-relational database system

Recent formula history

Mike McQuaid Deprecate tap.
ilovezfs php54-pdo-pgsql: bottle revision to rebuild.
Andy Blyler Revert "php 5.5.34"
Andy Blyler php 5.5.34
Andreas Braun Add description for pdo-pgsql formula

Formula code at GitHub