We're installing Python 3 versions of setuptools and numpy using this
script's "prepare" option, so force the build to use those (otherwise
it'll search for the Python 2 versions and won't find them).
Note: The Python bindings build still remains off (--disable-python)
since there are issues there that need to be investigated.
./autogen.sh
mkdir build
cd build
-PKG_CONFIG_PATH=$P ../configure $C $L --disable-python
+PKG_CONFIG_PATH=$P PYTHON=python3 ../configure $C $L --disable-python
$SB make $PARALLEL $V
PYTHONPATH=$PYPATH $SB make install $V
# $SB make check $V # TODO