Installing the PostgreSQL gem with 'gem pq' fails with ERROR: Failed to build gem native extension

Question

I am learning Ruby on Rails and trying to develop an application. In my application I am trying to use the default SQLite database in the Development Mode a

Answer 1

for those who reached this by google search if libpq-dev didnt work or threw another errors i hade the same problem try upgrading your system and get the ruby div-kit

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install ruby1.9.1-dev

then reboot after this just try again

...

Answer 2

If you are using Ubuntu try to install following lib file

sudo apt-get install libpq-dev

and then gem install pg

worked for me.

Answer 3

You have to do this

sudo apt-get install libgmp-dev libpq-dev

and then

gem install pg