rbenv installed ruby 2.1.2 cannot load such file — zlib on MAC OSX 10.9.2

Question

I\'m install ruby 2.1.2 via rbenv, and rbenv is installed by homebrew on my MAC OSX 10.9.2, ruby global is successful set to 2.1.2, but when i try to run gem install, get so

Answer 1

You need to install the zlib development headers.

xcode-select --install

In OS X 10.9, the command line developer tools are now installed on demand. So after running this also zlib and zlib-devel should be available.