Get a Python2.7 or PyPy2.7 (translates RPython faster) first. https://www.pypy.org/download.html Get the appropriate binary depending on the linux distribution. Unzip it
% git clone git@github.com:pymtl/pypy-pymtl3.git
% cd pypy-pymtl3/pypy/goal
% alias py2=<pypy2.7 you just downloaded or cpython2.7>
% py2 ../../rpython/bin/rpython --translation-jit_opencoder_model big -Ojit targetpypystandalone
Then package pypy to be able to get stow-ed.
% py2 ../tool/release/package.py --archive-name=pypy-install
Go to this tmp folder and copy it to stow packages
% cd /tmp/usession-master-<your netid>/build
% cp -rf pypy-install $STOW_PKGS_GLOBAL_PREFIX/pkgs
% cd $STOW_PKGS_GLOBAL_PREFIX/pkgs
Now, create a virtual environment:
% cd $VENV_PKGS_GLOBAL_PREFIX
% $STOW_PKGS_GLOBAL_PREFIX/pkgs/pypy-install/bin/pypy -m venv pypy-pymtl