Doing step by step as shown here:
http://www.raywenderlich.com/12139/introduction-to-cocoapods
I get an error when running pod install in different projects:
### Stack
```
CocoaPods : 0.15.2
Ruby : ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0]
RubyGems : 1.8.24
Host : Mac OS X 10.8.2 (12C60)
Xcode : 4.5.2 (4G2008a)
Ruby lib dir : /usr/local/rvm/rubies/ruby-1.9.3-p194/lib
Repositories : master - https://github.com/CocoaPods/Specs.git @ 60b51e341f727b7d715ed541ea9cb52f6e0cc819
```
### Podfile
```ruby
platform :ios, '6.0'
pod 'AFNetworking', '1.0'
```
### Error
```
invalid byte sequence in US-ASCII
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/local_pod.rb:540:in `glob'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/local_pod.rb:540:in `glob'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/local_pod.rb:540:in `block in expanded_paths'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/local_pod.rb:534:in `map'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/local_pod.rb:534:in `expanded_paths'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/local_pod.rb:327:in `readme_file'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/generator/documentation.rb:50:in `index_file'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/generator/documentation.rb:70:in `appledoc_options'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/generator/documentation.rb:81:in `generate'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/installer.rb:91:in `generate_docs'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/installer.rb:60:in `block (2 levels) in install_dependencies!'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/user_interface.rb:37:in `section'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/installer.rb:53:in `block in install_dependencies!'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/installer.rb:50:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/installer.rb:50:in `install_dependencies!'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/installer.rb:119:in `block in install!'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/user_interface.rb:37:in `section'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/installer.rb:118:in `install!'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/command/install.rb:46:in `run_install_with_update'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/command/install.rb:51:in `run'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/lib/cocoapods/command.rb:75:in `run'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/cocoapods-0.15.2/bin/pod:16:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p194/bin/pod:19:in `load'
/usr/local/rvm/gems/ruby-1.9.3-p194/bin/pod:19:in `<main>'
/usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
/usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'
```
Upd.:
➜ ~ gem install cocoapods
zsh: correct 'cocoapods' to '.cocoapods' [nyae]? n
Fetching: xcodeproj-0.4.0.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing cocoapods:
ERROR: Failed to build gem native extension.
/usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
checking for -std=c99 option to compiler... *** 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=/usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby
/usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:491:in `block in try_compile'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:443:in `with_werror'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:491:in `try_compile'
from extconf.rb:24:in `block in <main>'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
from extconf.rb:23:in `<main>'
Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p194/gems/xcodeproj-0.4.0 for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p194/gems/xcodeproj-0.4.0/ext/xcodeproj/gem_make.out
The problem was in Ruby compiler, it was corrupted by some other app.
After reinstall everything worked fine.