Fix #38

README.md

@@ -76,6 +76,7 @@ Regarding the source code or development version:
 * If you are unable to run **Pipenv**, e.g. `-bash: pipenv: command not found`, try `python -m pipenv` instead of only `pipenv`. Use `python3` instead of `python` if you are on a Mac or on a Linux machine.
 * If you have problems with **Pipenv**, for example `ModuleNotFoundError: No module named 'pkg_resources.extern'` or `Command "python setup.py egg_info" failed with error code 1`, make sure that the current version of `setuptools` is installed. You can fix that with `pip install --upgrade setuptools` within the virtual environment. Use `pip3` instead of `pip` if you are on a Mac or on a Linux machine.
 * If the application fails after **pulling from GitHub**, try updating the requirements in your virtual environment with `pipenv update`.
+* If you are on Linux and face issues with installing the dependencies (something with the library `regex` like `Python.h not found` or `x86_64-linux-gnu-gcc` not found), try installing the package `python3-dev` with `apt-get` first.
 * If you are on **Ubuntu 18.04** and get the error `[1:1:0100/000000.576372:ERROR:broker_posix.cc(43)] Invalid node channel message` after running the `topicsexplorer.py`, run `sudo apt-get install libglvnd-dev` in your command-line and try again.
 
 ## Developing