mail-mta/postfix with USE=postgres depends on dev-db/postgresql it should depend on dev-db/libpq, full postgresql build is not needed, only the libs Reproducible: Always
or the new virtual/postgresql-base
21 May 2008; Tiziano Müller <dev-zero@gentoo.org> postfix-2.2.11-r1.ebuild, postfix-2.3.8-r1.ebuild, postfix-2.4.6-r2.ebuild, postfix-2.4.7.ebuild, postfix-2.5.0.ebuild, postfix-2.5.1.ebuild: Changed dependency for postgresql from dev-db/postgresql to virtual/postgresql-server