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Use `gem install -v` You may already be familiar with gem install , but if you add the -v flag, you can specify the version of the gem to install. Using -v you can specify an exact version or use version comparators.
To install a gem, use gem install [gem] . Browsing installed gems is done with gem list . For more information about the gem command, see below or head to RubyGems' docs. There are other sources of libraries though.
You need install the postgreSQL dev package with header of PostgreSQL
sudo apt-get install libpq-dev
After reading and thrashing around for 2 days, and trying many things found in other notes the following single line was the cure for me on Ubuntu Lucid 10.04 mixed with some Maverick packages and RVM (ruby 1.9.2-p290, rvm 1.10.2 rubygems 1.8.15, rails 3.0.1, postgres 8.4.10) :
gem install pg -- --with-pg-lib=/usr/lib
the result:
Building native extensions. This could take a while...
Successfully installed pg-0.13.1
1 gem installed
Installing ri documentation for pg-0.13.1...
Installing RDoc documentation for pg-0.13.1...
{yea - finally success} !! !note that the output from running pg_config lacks the item -lpq in the LIBS variable on my Ubuntu / Postresql install!!
and why the switch from pq to pg in certain places -- confusing to newbie ??
the thing I still do not understand is the double set of -- and --with(option but I'm way beyond my depth anyway
In Ubuntu this works for me, I hope help you:
sudo apt-get install libpq-dev
and
gem install pg -- --with-pg-lib=/usr/lib
I'm on Ubuntu 12.10 and running this command:
apt-get install libpq-dev
helped me - after that ran gem install pg -v "0.14.1", and all good now
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