Just tried to set up cocoapods and ran into this error

checking for -std=c99 option to compiler... yes
checking for CoreFoundation... no
checking for main() in -lCoreFoundation... no
CoreFoundation is needed to build the Xcodeproj C extension.

Dislike. Finally found an answer that worked for me and didn’t resort to circumventing my homebrew / rvm setup, though it did involve installing a new ruby:

brew link autoconf
rvm install ruby-2.0.0-p353 --with-gcc=clang --verify-downloads 1
rvm use ruby-2.0.0-p353
gem install cocoapods

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