ubuntu で gem install do_postgres に失敗した

Ruby 
$ gem install do_postgres

したら以下のようにエラーになった。

Building native extensions.  This could take a while...
ERROR:  Error installing do_postgres:
    ERROR: Failed to build gem native extension.

    /usr/bin/ruby2.1 -r ./siteconf20150308-31837-a4mid6.rb extconf.rb
checking for main() in -lpq... yes
checking for libpq-fe.h... yes
checking for libpq/libpq-fs.h... yes
checking for postgres.h... no
*** 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/bin/ruby2.1
    --with-pgsql-server-dir
    --without-pgsql-server-dir
    --with-pgsql-server-include
    --without-pgsql-server-include=${pgsql-server-dir}/include
    --with-pgsql-server-lib
    --without-pgsql-server-lib=${pgsql-server-dir}/lib
    --with-pgsql-client-dir
    --without-pgsql-client-dir
    --with-pgsql-client-include
    --without-pgsql-client-include=${pgsql-client-dir}/include
    --with-pgsql-client-lib
    --without-pgsql-client-lib=${pgsql-client-dir}/lib
    --with-pqlib
    --without-pqlib
Could not find PostgreSQL build environment (libraries & headers): Makefile not created

extconf failed, exit code 1

Gem files will remain installed in /var/lib/gems/2.1.0/gems/do_postgres-0.10.15 for inspection.
Results logged to /var/lib/gems/2.1.0/extensions/x86_64-linux/2.1.0/do_postgres-0.10.15/gem_make.out

予め以下のものを入れておく必要があるみたい。

$ sudo apt-get install postgresql-9.3 postgresql-server-dev-9.3 libpq-dev

これでおっけー。

参照