问安装pg gem时找不到'libpq-fe.h头文件？

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 heade

*** 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-di

    --without-opt-di

    --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=.

    --curdi

    --ruby=/home/demonchand/.rvm/rubies/ruby-1.9.2-p0/bin/ruby

    --with-pg

    --without-pg

    --with-pg-di

    --without-pg-di

    --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