[build-pipenv.sh] modified command to create the pipenv virtual environment

build-pipenv.sh

@@ -11,16 +11,14 @@
 #
 # /////////////////////////////////////////////////////////////////
 
-BUILD_PYTHON_VERSION="3.6"
-
 if ! which pipenv
 	then
 		echo "Unable to detect a pipenv install.  Please install with 'pip install pipenv' then repeat your build attempt." 1>&2
 		exit 1
 fi
 
-# install fontTools and fontmake build dependencies with pipenv
-pipenv install --python $BUILD_PYTHON_VERSION --ignore-pipfile fontmake fontTools
+# create virtualenv and install build dependencies
+pipenv install --ignore-pipfile
 
 # test for fontmake install in venv
 if ! pipenv run fontmake --version