thoughtbot/paperclip — Issue #712: Cannot install 2.5.0 on OS X
Author: indirect
Created: 2012-01-21 00:26:18+00:00
State: open

```
$ ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin11.0]
$ gem -v
1.3.7
$ gem install paperclip --backtrace
ERROR: While executing gem ... (NoMethodError)
undefined method `call' for nil:NilClass
/Library/Ruby/Site/1.8/rubygems/requirement.rb:134:in `satisfied_by?'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:243:in `all?'
/Library/Ruby/Site/1.8/rubygems/requirement.rb:134:in `each'
/Library/Ruby/Site/1.8/rubygems/requirement.rb:134:in `all?'
/Library/Ruby/Site/1.8/rubygems/requirement.rb:134:in `satisfied_by?'
/Library/Ruby/Site/1.8/rubygems/source_index.rb:325:in `search'
/Library/Ruby/Site/1.8/rubygems/source_index.rb:323:in `select'
/Library/Ruby/Site/1.8/rubygems/source_index.rb:323:in `search'
/Library/Ruby/Site/1.8/rubygems/source_index.rb:280:in `find_name'
/Library/Ruby/Site/1.8/rubygems/installer.rb:243:in `installation_satisfies_dependency?'
/Library/Ruby/Site/1.8/rubygems/installer.rb:232:in `ensure_dependency'
/Library/Ruby/Site/1.8/rubygems/installer.rb:181:in `install'
/Library/Ruby/Site/1.8/rubygems/installer.rb:180:in `each'
/Library/Ruby/Site/1.8/rubygems/installer.rb:180:in `install'
/Library/Ruby/Site/1.8/rubygems/dependency_installer.rb:277:in `install'
/Library/Ruby/Site/1.8/rubygems/dependency_installer.rb:247:in `each'
/Library/Ruby/Site/1.8/rubygems/dependency_installer.rb:247:in `install'
/Library/Ruby/Site/1.8/rubygems/commands/install_command.rb:119:in `execute'
/Library/Ruby/Site/1.8/rubygems/commands/install_command.rb:116:in `each'
/Library/Ruby/Site/1.8/rubygems/commands/install_command.rb:116:in `execute'
/Library/Ruby/Site/1.8/rubygems/command.rb:270:in `invoke'
/Library/Ruby/Site/1.8/rubygems/command_manager.rb:134:in `process_args'
/Library/Ruby/Site/1.8/rubygems/command_manager.rb:104:in `run'
/Library/Ruby/Site/1.8/rubygems/gem_runner.rb:58:in `run'
/usr/bin/gem:21
```