I'm trying to install ROS 2 Iron into a new conda environment on my Mac (ARM architecture). I was following the instructions in this documentation but when I run colcon build --symlink-install --packages-skip-by-dep python_qt_binding I get the following error:

Traceback (most recent call last):
  File "/Users/jkelle/ros2_iron/src/ament/ament_cmake/ament_cmake_core/cmake/core/package_xml_2_cmake.py", line 22, in <module>
    from catkin_pkg.package import parse_package_string
ModuleNotFoundError: No module named 'catkin_pkg'


ERROR:colcon.colcon_notification.desktop_notification.terminal_notifier:Could not find the colcon-terminal-notifier.app in the install prefix '/Users/jkelle/miniconda3/envs/spl_ros'

I can see that catkin_pkg is installed an importable in my conda environment:

>> conda list | grep catkin_pkg
catkin_pkg                1.0.0              pyhd8ed1ab_0    conda-forge
>> python -c "from catkin_pkg.package import parse_package_string; print('success')"

I didn't disable SIP because I found this discussion suggesting it might not be necessary, and I really don't want to disable it if I don't need to.

My questions now are:

  1. Is there a working conda installation option?
  2. Do I really need to disable SIP?
  3. How should I proceed?
  • $\begingroup$ I have same issue on fresh installation of macOS Sonoma 14.2.1 on M1 core and SIP disabled. $\endgroup$
    – karelok
    Commented Jan 7 at 16:44
  • $\begingroup$ I try to build colcon from source, but no success. I am still getting error "Could not find the colcon-terminal-notifier.app." However I have checked the content of folder colcon-from-source/install/colcon-notification/ and the colcon-terminal-notifier.app is present in subfolder share/colcon-notification/. $\endgroup$
    – karelok
    Commented Jan 7 at 17:39

2 Answers 2


After some examination on macOS Sonoma I have managed to run colcon build --symlink-install --packages-skip-by-dep python_qt_binding. I am not completely done with build, but I made good progress. Below I summarize "hot fixes" I did. It is not clean approach, but it will enable to move on.


  • you work in python virtual environment (venv)
  • all ven prerequisites from Humble build tutorial are in place

Resolution of issue:

  1. build colcon from source as described on colcon install page

  2. Check how is EXACT name of colcon terminal notifier filename in: /YOUR_PATH/colcon-from-source/install/colcon-notification/share/colcon_notification

  3. Look for file: 'YOUR_PATH/colcon-from-source/install/colcon-notification/lib/python3.11/site-packages/colcon_notification/desktop_notification/terminal_notifier.py'

  4. Fix file name in function def _get_app_path(prefix_path):. In my case the name was: colcon-terminal-notifier instead of colcon_terminal_notifier

  5. Additional issue occurs with python interpreter reference. I was unable to manipulate python target via colcon switch and environment settings. I just updated the makefiles directly, i.e.:


In my case installing catkin_pkg in conda's base environment solved the issue.

pip install catkin_pkg

For more detailed answer, please refer 1st (numan) answer in this link



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