error running gem install pg -v '0.15.1'

问题

Running

gem install pg -v '0.15.1'

giving errors:

Building native extensions. This could take a while... ERROR: Error installing pg: ERROR: Failed to build gem native extension.
    /home/askar/.rvm/rubies/ruby-1.9.3-p429/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/askar/.rvm/rubies/ruby-1.9.3-p429/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/askar/.rvm/gems/ruby-1.9.3-p429/gems/pg-0.15.1 for inspection. Results logged to /home/askar/.rvm/gems/ruby-1.9.3-p429/gems/pg-0.15.1/ext/gem_make.out

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