Use conda-provided compiler toolchain on Linux

.github/workflows/ci.yml

@@ -46,7 +46,12 @@ jobs:
           environment-file: environment-dev.yml
           python-version: ${{ matrix.python }}
           miniconda-version: "latest"
-
+
+      - name: Install Conda GCC
+        if: runner.os == 'Linux'
+        run: |
+          conda install -y -c conda-forge gcc gxx
+
       - name: Install Helios
         run: |
           python -m pip install -v .

README.md

@@ -33,6 +33,11 @@ git clone https://github.com/3dgeo-heidelberg/helios.git
 cd helios
 conda env create -f environment-dev.yml
 conda activate helios-dev
+
+# On Linux, the following line is recommended, to go with a Conda-provided compiler.
+# We had issues with incompatible system compilers before.
+conda install -c conda-forge gcc gxx
+
 python -m pip install --no-deps -v -e .
 ```