$ psql

dyld: lazy symbol binding failed: Symbol not found:
_PQsetErrorContextVisibility
Referenced from: /usr/local/bin/psql
Expected in: /usr/local/lib/libpq.5.dylib

dyld: Symbol not found: _PQsetErrorContextVisibility
Referenced from: /usr/local/bin/psql
Expected in: /usr/local/lib/libpq.5.dylib

Abort trap: 6

PATH="/usr/local/bin/psql:/usr/local/sbin:/usr/local/bin:/sbin:/bin
:/usr/sbin:/usr/bin:/root/bin:/usr/local/bin/geckodrive‌​r:$PATH"
export PATH

rm '/usr/local/lib/libpq.5.dylib'
brew upgrade postgresql
brew link postgresql