The release notes for 4.6.3 mention compatibility with versions 7.2.3 and 7.3.2 of PostgreSQL. Is that the "minimum" version required? Can newer versions on the 7.2.x and 7.3.x branch be used? I noticed versions 7.2.4 and 7.3.3 are currently available.
They were the latest when we first branched 4.6, should work fine with 7.2.4 and hopefully any 7.3.1 or later though this hasn't been as thoroughly tested.