#I had to do something a bit different in order to get my pyenv #virtualenv to work.
#Run @psomhorst suggested config opt on the ^base^ python (in my case 3.6.6)
$ env PYTHON_CONFIGURE_OPTS="--enable-framework CC=clang" pyenv install 3.6.6
#Uninstall my virtualenv (if you already have one that you want to reuse)
$ pyenv uninstall py3