У меня было много проблем с Rails после перехода на Mountain Lion.

Пытаясь решить эти проблемы и часами искать в интернете, я сделал следующее, чтобы у моей системы были все зависимости для запуска rails после обновления:

I updated my Homebrew installation I updated my RVM installation I installed the XCode command line tools I installed GCC as mentioned I upgraded my version of Ruby to

ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]

My Rails version is verified as Rails 3.2.6

I also found out that Mountain Lion has some issues with Postgres so I saw this post and found out that I need to add this line to my Bash profile:

export PATH="/usr/local/bin:/usr/bin:$PATH"

Теперь я перехожу к своему Rails-приложению, которое раньше нормально работало на Snow Leopard перед обновлением, и когда я запускаюrails s в командной строке я получаю следующую ошибку:

AM@~/Documents/RailsWS/app0815 >gem install pg
 Building native extensions.  This could take a while...
 ERROR:  Error installing pg:
 ERROR: Failed to build gem native extension.
 /Users/AM/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb
 checking for pg_config... yes
 Using config values from /usr/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
--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/AM/.rvm/rubies/ruby-1.9.2-p290/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
--without-pg-config
--with-pg_config
--without-pg_config
 /Users/AM/.rvm/rubies/ruby-1.9.2-p290/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/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:452:in `try_cpp'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:853:in `block in   find_header'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:280:in `block (2  levels) in postpone'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
from /Users/AM/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/mkmf.rb:852:in `find_header'
from extconf.rb:41:in `<main>'


 Gem files will remain installed in /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.14.1 for inspection.
 Results logged to /Users/AM/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.14.1/ext/gem_make.out

Когда я иду в приложение Rails и пытаюсьbundle install это не удается при установке pg.