osx - Installation issue: "python setup.py egg_info" failed with error code 1 -

i following error after running pip install rpy2 on mac osx 10.11.2 , python 2.7.12:

collecting rpy2   downloading rpy2-2.8.2.tar.gz (186kb)     100% |████████████████████████████████| 194kb 3.0mb/s     complete output command python setup.py egg_info:     warning: tried guess r's home no command (r) in path.      ---------------------------------------- command "python setup.py egg_info" failed error code 1 in /private/var/folders/ml/wk8739s920z0rq1_rjrb2z980000gn/t/pip-build-8tia72/rpy2/ 

i have tried running sudo:

collecting rpy2   downloading rpy2-2.8.2.tar.gz (186kb)     100% |████████████████████████████████| 194kb 2.0mb/s     complete output command python setup.py egg_info:     warning: tried guess r's home no command (r) in path.      ---------------------------------------- command "python setup.py egg_info" failed error code 1 in /private/tmp/pip-build-fdffdi/rpy2/ 

i have tried pip install --upgrade setuptool , upgrading pip latest version nothing seems work.

could please help?

thank you.