If posgresql is installed via PostgreSQL apt repository, in order for Rails to use the 'pg' gem it is also necessary to install the 'libpq-dev' package, otherwise bundle install will fail. See at Stackoverflow Can't find the 'libpq-fe.h header when trying to install pg gem. <http://stackoverflow.com/questions/6040583/cant-find-the-libpq-fe-h-header-when-trying-to-install-pg-gem>
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