Trying to install sass but can't.
Getting the following 2 errors .
sudo gem install sass .
ERROR: Loading command: install (LoadError) . cannot load such file -- zlib .
ERROR: While executing gem ... (NoMethodError) . undefined method `invoke_with_build_args' for nil:NilClass
FYI: Ruby version - ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16] . xCode already installed .