CMake error when invoking catkin_make_isolated (Mac OS High Sierra)

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Hello everyone,

Ros newbie here, I am following the tutorial on Ros Wiki for installation of Ros Melodic for Mac OS X, and am encountering an issue when attempting to invoke catkin_make_isolated to build catkin packages. I'm running OS X 10.13 on a MacBook Air.

    $./src/catkin/bin/catkin_make_isolated --install -DCMAKE_BUILD_TYPE=Release -DCMAKE_MACOSX_RPATH=ON -DCMAKE_INSTALL_RPATH=$HOME/ros_catkin_ws/install_isolated/lib

Here is what happens when I run the above command:

Base path: /$HOME/ros_catkin_ws
Source space: /$HOME/ros_catkin_ws/src
Build space: /$HOME/ros_catkin_ws/build_isolated
Devel space: /$HOME/ros_catkin_ws/devel_isolated
Install space: /$HOME/ros_catkin_ws/install_isolated
Additional CMake Arguments: -DCMAKE_BUILD_TYPE=Release -DCMAKE_MACOSX_RPATH=ON 
DCMAKE_INSTALL_RPATH=/Users/JacobEpstein/ros_catkin_ws/install_isolated/lib

-- Using CATKIN_DEVEL_PREFIX: /$HOME/ros_catkin_ws/devel_isolated/catkin
-- Using CMAKE_PREFIX_PATH: 
-- Using PYTHON_EXECUTABLE: /usr/bin/python
-- Using default Python package layout
-- Using empy: /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/em.py
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /$HOME/ros_catkin_ws/build_isolated/catkin/test_results
-- Found gtest: gtests will be built
-- Using Python nosetests: /Library/Frameworks/Python.framework/Versions/3.6/bin/nosetests
-- catkin 0.7.28
-- BUILD_SHARED_LIBS is on
Traceback (most recent call last):
  File "/$HOME/ros_catkin_ws/src/catkin/cmake/interrogate_setup_dot_py.py", line 46, in <module>
    import setuptools
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/setuptools/__init__.py", line 21, in <module>
    import setuptools.version
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/setuptools/version.py", line 1, in <module>
    import pkg_resources
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pkg_resources/__init__.py", line 1380
    raise SyntaxError(e) from e
                            ^
SyntaxError: invalid syntax
CMake Error at cmake/safe_execute_process.cmake:11 (message):

  execute_process(/$HOME/ros_catkin_ws/build_isolated/catkin/catkin_generated/env_cached.sh
  "/usr/bin/python"
  "/$HOME/ros_catkin_ws/src/catkin/cmake/interrogate_setup_dot_py.py"
  "catkin" "/$HOME/ros_catkin_ws/src/catkin/setup.py"
  "/$HOME/ros_catkin_ws/build_isolated/catkin/catkin_generated/setup_py_interrogation.cmake")
  returned error code 1
Call Stack (most recent call first):
  cmake/catkin_python_setup.cmake:46 (safe_execute_process)
  CMakeLists.txt:23 (catkin_python_setup)

-- Configuring incomplete, errors occurred!

I am pretty sure something is going wrong when interrogate_setup_dot_py.py interrogates setup.py, but I do not know why this is. Any help would be much appreciated!

For reference, here is my setup.py file:

from catkin_pkg.python_setup import generate_distutils_setup
from setuptools import setup
import os

catkin_scripts = [
    'bin/catkin_find',
    'bin/catkin_init_workspace',
    'bin/catkin_make',
    'bin/catkin_make_isolated',
    'bin/catkin_test_results',
    'bin/catkin_topological_order',
]

if os.name == 'nt':
    import sys
    import shutil
    if sys.version_info.major == 2:
        # On Windows\Python2, Python scripts making use of multiprocessing
        # have to meet several requirements to work.
        # (catkin_pkg makes use of it to do parallel package parser.)
        #
        # One is that the scripts have to be ended with .py extension;
        # Otherwise, it will manifest as ImportError.
        if not os.path.isdir('build/bin'):
            os.makedirs('build/bin')
        for script in catkin_scripts:
            shutil.copyfile(script, 'build/%s.py' % script)
        catkin_scripts = ['build/%s.py' % script for script in catkin_scripts]

d = generate_distutils_setup(
    packages=['catkin'],
    package_dir={'': 'python'},
    scripts=catkin_scripts,
)

setup(**d)

It is unfortunately impossible for me to share my catkin build output at this ... (more)