[pypy-issue] Issue #2778: Need python3 build instructions (pypy/pypy)

[adamf663]

New issue 2778: Need python3 build instructions
https://bitbucket.org/pypy/pypy/issues/2778/need-python3-build-instructions

adamf663:

What are the instructions for building from source for python 3?
The instructions in the README.rst file, and at readthedocs use rpython.
Unfortunately, rpython has python 2 code  but running it for some reason uses python3 on the python2 code and predictably fails.
I've verified that 'python' and 'python2' bring up the python 2 interpreter.