Phantom half-install: How can I remove it completely?

I have been experiencing spooky behavior with Postgres after using the Mac
installer for Postgres. There seems to be an existing half-baked Postgres
installation that was already there and remains there after I deleted the
Mac GUI installer version from /Applications and /Library. Part of the
spooky behavior included being unable after repeated poking and prodding to
get a particular user to authenticate with its behavior--but this makes
sense if I had two parallel Postgres databases, one for which I was
(successfully) setting the user with a particular password, and one which
did not have this database set. Now that that version is uninstalled, I
have a number of Postgres binaries that crash or give errors if I try to
use them:

$ psql
dyld: Library not loaded: /usr/lib/libpq.5.dylib
Referenced from: /usr/bin/psql
Reason: image not found
Trace/BPT trap: 5
$

I have not used MacPorts, Fink, or other Unix installers other than
Homebrew in the life of this Mac. Homebrew disclaims ownership of a
Postgres installation:

# ls /usr/local/Cellar | grep -i postgres
#

So however installed, I have a broken Postgres installation that I would
like to wipe completely.

How can I completely wipe Postgres from my system so I can install it with
the installer and have one Postgres installation, instead of a spooky one
and a half installations?

--
[image: Christos Jonathan Hayward] <http://jonathanscorner.com/>
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