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PostgreSQL gem pg was unable to install

My DB is PostgreSQL.I am on CENTOS.... While installing the pg gem I received the following error. I reinstalled to clear my YAML problem also, which didn't work, but it is just a warning. My main problem is the installation of the pg gem:

[root@vdimc04 ~]# gem install pg
/usr/local/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

        /usr/local/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=/usr/local/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 /usr/local/lib/ruby/gems/1.9.1/gems/pg-0.14.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/pg-0.14.1/ext/gem_make.out

I also tried with the following command, but to no use:

 gem install pg -- --with-pg-config=/usr/pgsql-9.1/bin/pg_config
Solution

  • I got the same error on Centos. By googling I found two commands to use:

    1. yum install postgresql-libs -- It gave me message saying, its already installed.
    2. yum install postgresql-devel -- It solved my error related to pg_config for installing the 'pg' .gem.

    Hope it helps :)

    apos wrote: on Ubuntu 14.04 install:

    1. apt-get install postgresql-server-dev-9.3 libpq-dev