diff --git a/.github/workflows/conda_build.yaml b/.github/workflows/conda_build.yaml
index f8b18878..842d98b7 100644
--- a/.github/workflows/conda_build.yaml
+++ b/.github/workflows/conda_build.yaml
@@ -51,7 +51,7 @@ jobs:
 
       - name: Build library
         run: |
-          conda build conda --output-folder conda_package
+          conda build conda --output-folder conda_package --variant-config-files conda/variants/unix.yaml
       
       - name: Upload artifact   
         uses: actions/upload-artifact@v4
@@ -145,7 +145,7 @@ jobs:
 
       - name: Build library
         run: |
-          conda build conda --output-folder conda_package --variant-config-files conda/variants/macOS.yaml
+          conda build conda --output-folder conda_package --variant-config-files conda/variants/unix.yaml
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
diff --git a/.github/workflows/test_library.yaml b/.github/workflows/test_library.yaml
index 605211b4..54db2656 100644
--- a/.github/workflows/test_library.yaml
+++ b/.github/workflows/test_library.yaml
@@ -7,9 +7,6 @@ concurrency:
 
 on: [push, pull_request]
 
-env:
-  COMPILER: c++
-
 jobs:
 
   Tests-Viewshed-library:
@@ -60,15 +57,16 @@ jobs:
             -S . \
             -B build \
             -G Ninja \
-            -DCMAKE_CXX_COMPILER=${COMPILER} \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DPACK_DEB:bool=off \
-            -DBUILD_DOCUMENTATION:bool=off \
-            -DBUILD_TESTS:bool=on \
-            -DCELL_EVENT_DATA_FLOAT:bool=on \
-            -DOUTPUT_RASTER_DATA_FLOAT:bool=on \
-            -DNEEDS_QT:bool=off \
-            -DBUILD_GUI_APP:bool=off
+            -D CMAKE_C_COMPILER=clang \
+            -D CMAKE_CXX_COMPILER=clang++ \
+            -D CMAKE_BUILD_TYPE=Release \
+            -D PACK_DEB:bool=off \
+            -D BUILD_DOCUMENTATION:bool=off \
+            -D BUILD_TESTS:bool=on \
+            -D CELL_EVENT_DATA_FLOAT:bool=on \
+            -D OUTPUT_RASTER_DATA_FLOAT:bool=on \
+            -D NEEDS_QT:bool=off \
+            -D BUILD_GUI_APP:bool=off
 
       - name: Build
         run: | 
@@ -92,15 +90,16 @@ jobs:
             -S . \
             -B build \
             -G Ninja \
-            -DCMAKE_CXX_COMPILER=${COMPILER} \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DPACK_DEB:bool=off \
-            -DBUILD_DOCUMENTATION:bool=off \
-            -DBUILD_TESTS:bool=on \
-            -DCELL_EVENT_DATA_FLOAT:bool=off \
-            -DOUTPUT_RASTER_DATA_FLOAT:bool=off \
-            -DNEEDS_QT:bool=off \
-            -DBUILD_GUI_APP:bool=off
+            -D CMAKE_C_COMPILER=clang \
+            -D CMAKE_CXX_COMPILER=clang++ \
+            -D CMAKE_BUILD_TYPE=Release \
+            -D PACK_DEB:bool=off \
+            -D BUILD_DOCUMENTATION:bool=off \
+            -D BUILD_TESTS:bool=on \
+            -D CELL_EVENT_DATA_FLOAT:bool=off \
+            -D OUTPUT_RASTER_DATA_FLOAT:bool=off \
+            -D NEEDS_QT:bool=off \
+            -D BUILD_GUI_APP:bool=off
           cmake --build build --config Release --target build_tests
           cmake --build build --config Release --target run_tests
 
@@ -153,18 +152,19 @@ jobs:
         run: | 
           cmake \
             -S . \
-            -Bbuild \
+            -B build \
             -G Ninja \
-            -DCMAKE_CXX_COMPILER=${COMPILER} \
-            -DCMAKE_BUILD_TYPE=Release \
-            -DPACK_DEB:bool=off \
-            -DBUILD_DOCUMENTATION:bool=off \
-            -DBUILD_TESTS:bool=on \
-            -DCELL_EVENT_DATA_FLOAT:bool=on \
-            -DOUTPUT_RASTER_DATA_FLOAT:bool=on \
-            -DNEEDS_QT:bool=on \
-            -DBUILD_GUI_APP:bool=on \
-            -DCMAKE_INSTALL_PREFIX=/usr \
+            -D CMAKE_C_COMPILER=clang \
+            -D CMAKE_CXX_COMPILER=clang++ \
+            -D CMAKE_BUILD_TYPE=Release \
+            -D PACK_DEB:bool=off \
+            -D BUILD_DOCUMENTATION:bool=off \
+            -D BUILD_TESTS:bool=on \
+            -D CELL_EVENT_DATA_FLOAT:bool=on \
+            -D OUTPUT_RASTER_DATA_FLOAT:bool=on \
+            -D NEEDS_QT:bool=on \
+            -D BUILD_GUI_APP:bool=on \
+            -D CMAKE_INSTALL_PREFIX=/usr \
       
       - name: Run Tests even with Qt
         id: unittestsqt
diff --git a/conda/variants/macOS.yaml b/conda/variants/unix.yaml
similarity index 100%
rename from conda/variants/macOS.yaml
rename to conda/variants/unix.yaml
diff --git a/scripts/install.sh b/scripts/install.sh
index 89ec24f6..27382ed9 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -4,6 +4,7 @@ cmake \
     -S . \
     -B build \
     -G Ninja \
+    -D CMAKE_C_COMPILER=clang \
     -D CMAKE_CXX_COMPILER=clang++ \
     -D CMAKE_BUILD_TYPE=Release \
     -D PACK_DEB:bool=ON \