postgres_targets options

postgres10
Build against PostgreSQL 10
postgres11
Build against PostgreSQL 11
postgres12
Build against PostgreSQL 12
postgres13
Build against PostgreSQL 13
postgres9_3
Build against PostgreSQL 9.3
postgres9_4
Build against PostgreSQL 9.4
postgres9_5
Build against PostgreSQL 9.5
postgres9_6
Build against PostgreSQL 9.6