Installing the pg PostgreSQL gem on Mac OS X
I've recently switched from using MySQL to PostgreSQL for my Ruby projects. You can connect to a PostgreSQL database from Ruby using the
pg gem, but if the
pg_config program isn't in your path you'll run into problems during installation.
$ sudo gem install pg Building native extensions. This could take a while... ERROR: Error installing pg: ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb install pg extconf.rb:1: command not found: pg_config --version ERROR: can't find pg_config. HINT: Make sure pg_config is in your PATH ...
A few minutes later I realised I'd installed my copy of PostgreSQL using the one click installer, which puts the database server in the
/Library/PostgreSQL directory. This sorted it:
$ PATH=$PATH:/Library/PostgreSQL/8.3/bin sudo gem install pg