Note that this is OSX only. Don't know how to deal with the whole NSSize/CGSize, etc dance.

RXCollections.podspec

Pod::Spec.new do |s|
  s.name         = "RXCollections"
  s.version      = "1.2.1"
  s.summary      = "map, filter, fold, and detect for Cocoa collections."
  s.homepage     = "https://github.com/robrix/RXCollections"
  s.license      = 'BSD'
  s.platform   = :osx, '10.8'
  s.author       = { "Rob Rix" => "rob.rix@me.com" }
  s.framework    = 'Foundation'
  s.source       = { :git => "https://github.com/robrix/RXCollections.git", :tag => "#{s.version}" }
  s.source_files = 'RXCollections/*.{h,m}', 'External/Lagrangian/Lagrangian/*.{h,m}', 'External/Lagrangian/External/RXPreprocessing/*.{h,m}'
  s.requires_arc = true

  s.prepare_command = <<-'END'
    find . -regex '.*\.[hm]' -exec sed -i '' -E 's@<Lagrangian/(.*)\.h>@<RXCollections/\1.h>@' {} \;
  END
  
end

-> RXCollections (1.2.1)
- ERROR | [OSX] [xcodebuild] RXCollections/External/Lagrangian/Lagrangian/L3TestRunner.m:47:1: error: unexpected '@' in program
- ERROR | [OSX] [xcodebuild] RXCollections/External/Lagrangian/Lagrangian/L3TestRunner.m:176:103: error: use of undeclared identifier 'test_function'
- ERROR | [OSX] [xcodebuild] RXCollections/External/Lagrangian/Lagrangian/L3TestRunner.m:190:103: error: use of undeclared identifier 'test_function'
- ERROR | [OSX] [xcodebuild] RXCollections/External/Lagrangian/Lagrangian/L3TestRunner.m:223:1: error: missing context for method declaration
- ERROR | [OSX] [xcodebuild] RXCollections/External/Lagrangian/Lagrangian/L3TestRunner.m:287:1: error: missing context for method declaration
- ERROR | [OSX] [xcodebuild] RXCollections/External/Lagrangian/Lagrangian/L3TestRunner.m:301:1: error: '@EnD' must appear in an Objective-C context