Raylar 3.1 ön sürüm kullanıyorum. PostgreSQL kullanmak istiyorum ama sorun pg gem yüklüyor. Bana aşağıdaki hatayı veriyor:

demonchand@system-001:~/exercise/personal/pro$ gem install pg
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

        /home/demonchand/.rvm/rubies/ruby-1.9.2-p0/bin/ruby extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
 --with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/home/demonchand/.rvm/rubies/ruby-1.9.2-p0/bin/ruby
    --with-pg
    --without-pg
    --with-pg-dir
    --without-pg-dir
    --with-pg-include
    --without-pg-include=${pg-dir}/include
    --with-pg-lib
    --without-pg-lib=${pg-dir}/lib
    --with-pg-config
    --without-pg-config
    --with-pg_config
    --without-pg_config


Gem files will remain installed in /home/demonchand/.rvm/gems/ruby-1.9.2-p0/gems/pg-0.11.0 for inspection.
Results logged to /home/demonchand/.rvm/gems/ruby-1.9.2-p0/gems/pg-0.11.0/ext/gem_make.out

Herkes bu sorunu nasıl çözerim bana söyleyebilir misiniz?

Bu başlık gibi görünüyor libpq-dev package (en az aşağıdaki Ubuntu sürümleri: Natty, Berrak, Oneiric, Hassas Pangolin ve Trusty Tahr): parçasıdır

...
/usr/include/postgresql/libpq-fe.h
...

Yani libpq-dev yüklemeyi deneyin:

• Ubuntu sistemler için: sudo apt-get install libpq-dev
• RHEL sistemlerde: yum install postgresql-devel
• Mac için: brew install postgresql