Error installing pg gem on osx - ruby-on-rails

Question

I am on osx 10.6.7 trying to run bundle install on a new rails 3.0.7 app and it keeps failing when trying to build the pg gem. It keeps telling me that I have need the developer tools. But as far as I can tell I have the developer tools installed.
Here is the output of xcodebuild -version
Xcode 3.2.6
Component versions: DevToolsCore-1809.0; DevToolsSupport-1806.0
BuildVersion: 10M2518
Here is the output of the failed pg gem build
/Users/bm/.rvm/rubies/ruby-1.9.2-head/bin/ruby extconf.rb --with-pg-config=/Library/PostgreSQL/8.4/bin/pg_config
Using config values from /Library/PostgreSQL/8.4/bin/pg_config
checking for libpq-fe.h... *** 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=/Users/bm/.rvm/rubies/ruby-1.9.2-head/bin/ruby
--with-pg
--without-pg
--with-pg-dir
--without-pg-dir
--with-pg-include
--without-pg-include=${pg-dir}/include
--with-pg-lib
--without-pg-lib=${pg-dir}/lib
--with-pg-config
/Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:452:in `try_cpp'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:853:in `block in find_header'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:852:in `find_header'
from extconf.rb:31:in `<main>'
Gem files will remain installed in /Users/bm/.rvm/gems/ruby-1.9.2-head#rc_search/gems/pg-0.11.0 for inspection.
Results logged to /Users/bm/.rvm/gems/ruby-1.9.2-head#rc_search/gems/pg-0.11.0/ext/gem_make.out
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/rubygems/installer.rb:486:in `block in build_extensions'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/rubygems/installer.rb:446:in `each'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/rubygems/installer.rb:446:in `build_extensions'
from /Users/bm/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/rubygems/installer.rb:198:in `install'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/source.rb:100:in `install'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/installer.rb:55:in `block in run'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/spec_set.rb:12:in `block in each'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/spec_set.rb:12:in `each'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/spec_set.rb:12:in `each'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/installer.rb:44:in `run'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/installer.rb:8:in `install'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/cli.rb:217:in `install'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/vendor/thor/task.rb:22:in `run'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/vendor/thor.rb:246:in `dispatch'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/lib/bundler/vendor/thor/base.rb:389:in `start'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/gems/bundler-1.0.0/bin/bundle:13:in `<top (required)>'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/bin/bundle:19:in `load'
from /Users/bm/.rvm/gems/ruby-1.9.2-head#global/bin/bundle:19:in `<main>'
Any help would be immensely appreciated. FYI I also tried building the app with a mysql and essentially got the same stack. So I'm pretty sure I'm missing some sort of developer build tools, but I just don't know which ones. :(

Answer 1

I had the exact same problem when running bundle install in a Rails app. I installed homebrew and then ran
brew install postgresql.
That finally installed postgres correctly and the issue was fixed for me.

Answer 2

export ARCHFLAGS='-arch x86_64'
export PATH=/Library/PostgreSQL/9.1/bin:${PATH}
gem install pg

Answer 3

If you are using the PostgreSQL app on osx, you may need to change path the following (as the location of the binaries and config files changes) instead of the path shown in lesyk's answer:
export PATH=/Applications/Postgres.app/Contents/MacOS/bin:${PATH}

Answer 4

What worked for me was Zag Zag's comment:
~/projects/foo$ env ARCHFLAGS="-arch x86_64" gem install pg
Building native extensions. This could take a while...
Successfully installed pg-0.11.0
1 gem installed
Building YARD (yri) index for pg-0.11.0...
~/projects/foo$ bundle
...
Using pg (0.11.0)
...
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

Answer 5

I had the same issue. For me the fix was:
sudo ln -s gcc /usr/bin/gcc-4.2

Answer 6

I also ran into this issue, for me the answer was updating RVM of all things.
rvm get head
rvm install 1.9.2

Answer 7

I'm on the same OSX and XCode version as you are: bundle install with pg 0.11.0 works fine to me.
However, I found this article that might be able to help you
fixing-the-you-have-to-install-development-tools-first-error-with-nokogiri
If you're using rvm, you can try:
rvm update head
rvm --force install
1.9.2 gem install bundle
Here my stack:
[ 08:36:26 ] > bundle install
Fetching source index for http://rubygems.org/
Enter your password to install the bundled RubyGems to your system:
Using rake (0.8.7)
Using abstract (1.0.0)
Installing activesupport (3.0.7)
Installing builder (2.1.2)
Installing i18n (0.5.0)
Installing activemodel (3.0.7)
Using erubis (2.6.6)
Using rack (1.2.2)
Installing rack-mount (0.6.14)
Installing rack-test (0.5.7)
Installing tzinfo (0.3.27)
Installing actionpack (3.0.7)
Using mime-types (1.16)
Installing polyglot (0.3.1)
Installing treetop (1.4.9)
Installing mail (2.2.19)
Installing actionmailer (3.0.7)
Installing arel (2.0.9)
Installing activerecord (3.0.7)
Installing activeresource (3.0.7)
Using bundler (1.0.10)
Installing pg (0.11.0) with native extensions
Using thor (0.14.6)
Installing railties (3.0.7)
Installing rails (3.0.7)
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.
[ ronda#MacBook ~/Projects/rails_projects/first_app ]
[ 08:42:57 ] > rails server
=> Booting WEBrick
=> Rails 3.0.7 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2011-04-27 20:45:27] INFO WEBrick 1.3.1
[2011-04-27 20:45:27] INFO ruby 1.9.2 (2011-02-18) [x86_64-darwin10]
[2011-04-27 20:45:27] INFO WEBrick::HTTPServer#start: pid=4757 port=3000

Answer 8

The simple solution:
run brew install postgresql
install the gem with sudo permissions: like so:
sudo gem install pg -v '0.17.1'

Answer 9

I was stuck on my bundle install for 3 days. Tried Everything like adding env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/usr/local/Cellar/postgresql/9.3.5_1/bin/pg_config
I was able to see pg gem getting installed after this command but still it was not installing from bundle install, which was a pain because I dint know what to write in Gemfile except gem 'pg'
The thing which finally worked for me was to find that my pg_config was in /Library/PostgreSQL/9.3/bin/pg_config and by default the Gemfile bundle install looks in /usr/local/bin/pg_config
I just ran the following command and magic happened. bundle config build.pg --with-pg-config=/Library/PostgreSQL/9.3/bin/pg_config

Answer 10

Some correction. For those who have installed postgres using homebrew.
1) write the following line in your ~/.bash_profile
export ARCHFLAGS="-arch x86_64"
2) restart console
3) execute following command
bundle config build.pg --with-pg-config=/usr/local/Cellar/postgresql/9.3.5_1/bin/pg_config (this has to be your pg config address, can differ for each depending on versions of postgres)
4) Install pg once locally by running this command
sudo env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/usr/local/Cellar/postgresql/9.3.5_1/bin/pg_config
5) bundle install