find postgres cmake module does not check default postgres prefix

[kyngchaos]

FindPostgreSQL.cmake does not check the default prefix of postgres - /usr/local/pgsql. At least, that's the default I've always gotten on OSX without specifying --prefix.

AND, when I try to set POSTGRESQL_INCLUDE_DIR and POSTGRESQL_LIBRARIES in the cmake config command to get around this problem, the values I give it are not used (include error, and nothing in cmakecache.txt), though it tells me it succeeded in finding postgres.