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Wilco van Esch

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    Cannot load such file -- 2.3/pg_ext (LoadError)

    Setting up PostgreSQL with Ruby 2.3, you may encounter this error:

    LoadError: cannot load such file -- 2.3/pg_ext

    This is due to the native extensions being built for Ruby 2.2 instead.

    How I solved this:

    Uninstall the pg gem

    gem uninstall pg

    Instead of pg gem v0.18 install a pre-release version of v0.19

    gem install pg --pre

    In your Gemfile, ensure it will pick up the pre-release version

    gem 'pg', '>= 0.19.0.beta'