How to install PostgreSQL's pg gem on Ubuntu? - ruby

Question

I'm trying to install PostgreSQL's pg gem for Ruby.
I issued the following command:
gem install pg
I installed Ruby 1.9.2 using RVM.
The above command shows me the following error.
The error is :
Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
/home/User/.rvm/rubies/ruby-1.9.2-preview3/bin/ruby extconf.rb
checking for pg_config... yes
checking for libpq-fe.h... yes
checking for libpq/libpq-fs.h... yes
checking for PQconnectdb() in -lpq... no
checking for PQconnectdb() in -llibpq... no
checking for PQconnectdb() in -lms/libpq... no
Can't find the PostgreSQL client library (libpq)
*** 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/User/.rvm/rubies/ruby-1.9.2-preview3/bin/ruby
--with-pg
--without-pg
--with-pg-config
--without-pg-config
--with-pg-dir
--without-pg-dir
--with-pg-include
--without-pg-include=${pg-dir}/include
--with-pg-lib
--without-pg-lib=${pg-dir}/lib
--enable-static-build
--disable-static-build
--with-pqlib
--without-pqlib
--with-libpqlib
--without-libpqlib
--with-ms/libpqlib
--without-ms/libpqlib
Gem files will remain installed in /home/user/.rvm/gems/ruby-1.9.2-preview3/gems/pg-0.9.0 for inspection.
Results logged to /home/user/.rvm/gems/ruby-1.9.2-preview3/gems/pg-0.9.0/ext/gem_make.out
I don't know what is the error...

Answer 1

You need install the postgreSQL dev package with header of PostgreSQL
sudo apt-get install libpq-dev

Answer 2

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

Answer 3

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

Answer 4

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

Answer 5

Installing libpq-dev did not work for me. I also needed to install build-essential
sudo apt-get install libpq-dev build-essential

Answer 6

Need to add package
sudo apt-get install libpq-dev
to install pg gem in RoR

Answer 7

Simple solution for ubuntu users...
First uninstall all postgres packages, then run these commads...
sudo apt-get install postgresql
sudo apt-get install postgresql-client libpq5 libpq-dev
# for rvm (single user)
mv ~/.rvm/usr/lib ~/.rvm/usr/lib_rvm
# for rvm (multi-user)
mv /usr/local/rvm/usr/lib /usr/local/rvm/usr/lib_rvm
gem install pg -- --with-pg-lib=/usr/lib
Then run 'bundle install'. Every thing will be fine. Have a good day!

Answer 8

sudo apt-get install postgresql-client libpq5 libpq-dev then do gem install pg

Answer 9

For .RVM users it will be better:
rvmsudo gem install pg -- --with-pg-lib=/usr/lib
it worked for me (after i saw jdupont version)

Answer 10

If you have libpq-dev installed and are still having this problem it is likely due to conflicting versions of OpenSSL's libssl and friends - the Ubuntu system version in /usr/lib (which libpq is built against) and a second version RVM installed in $HOME/.rvm/usr/lib (or /usr/local/rvm/usr/lib if it's a system install). You can verify this by temporarily renaming $HOME/.rvm/usr/lib and seeing if "gem install pg" works.
To solve the problem have rvm rebuild using the system OpenSSL libraries (you may need to manually remove libssl.* and libcrypto.* from the rvm/usr/lib dir):
rvm reinstall 1.9.3 --with-openssl-dir=/usr
This finally solved the problem for me on Ubunto 12.04.

Answer 11

Try this
sudo apt-get install postgresql postgresql-contrib libpq-dev
You should install PG Database server in the first place to install clients. Afterwards, you install clients.
See this blog post to know about setting up PostGresSQL for the first time for Ruby on Rails development.

Answer 12

This solved the problem for me on Ubuntu 12.04 after every suggestion here had failed.
rvmsudo gem install pg -v '0.12.2' -- --with-pg-lib=/usr/include/postgresql

Answer 13

I was trying to setup a Rails project in my freshly installed Ubuntu 16.04. I ran into the same issue while running bundle. Running
sudo apt-get install aptitude
followed by
sudo apt-get install libpq-dev
Solved it for me.

Answer 14

For anyone who is still having issues after trying all the answers on this page, the following (finally) worked:
sudo apt-get install libgmp3-dev
gem install pg
This was after doing everything else mentioned on this page.
postgresql 9.5.8
Ubuntu 16.10

Answer 15

Another solution to this problem is to install PostgreSQL using Homebrew/linuxbrew:
brew install postgresql
As a matter of habit I don't like to use sudo unless I have to.

Answer 16

For those trying to install Redmine, I missed sudo apt-get install ruby-all-dev after trying all of the above.
Initial error being mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h.

Answer 17

I had the same problem, and tried a lot of different variants. After some tries I became able to sudo gem install, but still have problem to install it without sudo.
Finally I found a decission - reinstalling of rvm helped me. Probably it can save time somebody else.

Answer 18

apt-get install ruby-dev worked for me.

Answer 19

Another option is to use Homebrew which works on Linux and macOS to install just the supporting libraries:
brew install libpq
then
brew link libpq --force
(the --force option is required because it conflicts with the postgres formula.)