Unable To Install Rpy2

On mac 10.12.6, pip install rpy2 is giving me 'Failed building wheel for rpy2' I tried the this. Any ideas what to look at next? Here is the error log: -------------------------

Solution 1:

The start of an answer, not yet working:

A/the rpy2 developer pointed me to this.

I followed the instructions here (for R >= 3.4.0) resulting in a new directories clang4 and gfortran in /usr/local. I also set up the ~/.R/Makevars file as suggested. (There was no ~/.R dir on my system previously). Doing these things had no evident effect.

I'm guessing I'm missing something basic. Should I be re-installing R? Exporting some environment variables?