Updated config.sh to default to python2 if both are present.  This is the same default that the reset of the build system uses.
@@ -26,7 +26,7 @@ export SOURCE_DIR=$(pwd)
export BUILD_DIR=$SOURCE_DIR/${1:-build}
export INSTALL_DIR=$SOURCE_DIR/${2:-install}
-PYTHON_BIN=`type -P python3 || type -P python`
+PYTHON_BIN=`type -P python || type -P python3`
PYTHON_LIB=$(${PYTHON_BIN} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(prefix='$INSTALL_DIR'))")
export LD_LIBRARY_PATH=$INSTALL_DIR/lib64:$INSTALL_DIR/lib:$LD_LIBRARY_PATH
