If the current virtualenv is created with `--system-site-packages` and an executable is not found in it, automatically look up the executable for source Python version. (fixes #62)
If the current virtualenv is created with `--system-site-packages` and
an executable is not found in it, automatically look up the executable
for source Python version. (fixes #62)

jerr0328/pyenv-virtualenv,aristiden7o/pyenv-virtualenv,pyenv/pyenv-virtualenv,yyuu/pyenv-virtualenv,yeonsh/pyenv-virtualenv