Cannot install pg gem in Mavericks with Postgres.app

You probably have the wrong path for --with-pg-config, check if it’s actually there.

You can find the correct path to pg_config with:

find /Applications -name pg_config

In the latest Postgres.app Version the path is:

gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.5/bin/pg_config

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