Gemfile in calatrava-0.6.6 vs Gemfile in calatrava-0.6.7

@@ -1,6 +1,8 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in calatrava.gemspec
 gemspec
-xcodeproj
-cocoapods
+if RUBY_PLATFORM =~ /darwin/
+  gem "xcodeproj"
+  gem "cocoapods"
+end