CocoaPods/CocoaPods — comment on commit f6e3c90c2eb285bbb9f52c1852666f9ab298786a
File: lib/cocoapods/installer.rb line 90
By lukeredpath:

In an earlier refactoring, it looked like nothing was using build_specifications the target installer anymore so I removed the shared module, but I missed this call here.

There's probably an easy way to get it back to the functionality from before.