Can't find the 'libpq-fe.h header when trying to install pg gem

Question

I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error:

Answer 1

For AltLinux the package postgresqlx.x-devel (in my case postgresql9.5-devel) must be installed:

apt-get install postgresql9.5-devel