diff --git a/.github/job_matrix.py b/.github/job_matrix.py
index c490095415..37cfef3f44 100644
--- a/.github/job_matrix.py
+++ b/.github/job_matrix.py
@@ -119,7 +119,7 @@ def for_github(self):
         # expose individual ConanOptions fields as top-level matrix properties
         # (needed for YAML conditions and cache keys)
         ret.update(features)
-        ret["conan-config"] = " ".join(f"-o '&:{k}={v}'" for k, v in features.items())
+        options = " ".join(f"-o '&:{k}={v}'" for k, v in features.items())
         ret["config-summary-str"] = self.infostr(adjusted=False)
         # Pre-build the -s flags so workflows and repro scripts can use them directly
         # without sed-patching the auto-detected Conan profile.
@@ -141,6 +141,13 @@ def for_github(self):
         ret["conan-build-folder"] = (
             f"{_COMPILER_TYPE_MAP[self.toolchain.compiler.type]}-{self.toolchain.compiler.version}-{self.std}"
         )
+        cc = self.toolchain.compiler.cc
+        cxx = self.toolchain.compiler.cxx
+        if cc and cxx:
+            conf = f'-c \'tools.build:compiler_executables={{"c": "{cc}", "cpp": "{cxx}"}}\''
+            ret["conan-args"] = f"{conf} {options}"
+        else:
+            ret["conan-args"] = options
         return ret
 
     def _formatters():
diff --git a/.github/workflows/ci-clang-tidy.yml b/.github/workflows/ci-clang-tidy.yml
index 2b65e6e72c..414e6d691f 100644
--- a/.github/workflows/ci-clang-tidy.yml
+++ b/.github/workflows/ci-clang-tidy.yml
@@ -147,7 +147,7 @@ jobs:
           conan build . -b missing ${{ matrix.conan-settings }} \
                         -c tools.cmake.cmaketoolchain:generator="Ninja Multi-Config" \
                         -c user.mp-units.build:all=True -c user.mp-units.analyze:clang-tidy=True -c tools.build:skip_test=True \
-                        ${{ matrix.conan-config }} 2>&1 | tee /tmp/clang-tidy.log
+                        ${{ matrix.conan-args }} 2>&1 | tee /tmp/clang-tidy.log
           exit ${PIPESTATUS[0]}
       - name: Emit clang-tidy annotations
         if: failure()
@@ -185,5 +185,5 @@ jobs:
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "**Local repro** (in the provided '.devcontainer' or GitHub CodeSpaces environment):" >> $GITHUB_STEP_SUMMARY
           echo '```sh' >> $GITHUB_STEP_SUMMARY
-          echo "conan build . -b missing ${{ matrix.conan-settings }} -c user.mp-units.build:all=True -c user.mp-units.analyze:clang-tidy=True -c tools.build:skip_test=True ${{ matrix.conan-config }}" >> $GITHUB_STEP_SUMMARY
+          echo "conan build . -b missing ${{ matrix.conan-settings }} -c user.mp-units.build:all=True -c user.mp-units.analyze:clang-tidy=True -c tools.build:skip_test=True ${{ matrix.conan-args }}" >> $GITHUB_STEP_SUMMARY
           echo '```' >> $GITHUB_STEP_SUMMARY
diff --git a/.github/workflows/ci-conan.yml b/.github/workflows/ci-conan.yml
index d1f53435b1..cce79f0d13 100644
--- a/.github/workflows/ci-conan.yml
+++ b/.github/workflows/ci-conan.yml
@@ -170,7 +170,7 @@ jobs:
           conan create . --user mpusz --channel ${CHANNEL} --lockfile-out=package.lock \
                          -b mp-units/* -b missing ${{ matrix.conan-settings }} \
                          -c tools.cmake.cmaketoolchain:generator="Ninja Multi-Config" -c user.mp-units.build:all=True \
-                         ${{ matrix.conan-config }}
+                         ${{ matrix.conan-args }}
       - name: Create Conan package
         if: matrix.toolchain.compiler.type == 'MSVC'
         shell: bash
@@ -178,7 +178,7 @@ jobs:
           conan create . --user mpusz --channel ${CHANNEL} --lockfile-out=package.lock \
                          -b mp-units/* -b missing ${{ matrix.conan-settings }} \
                          -c tools.cmake.cmaketoolchain:generator="Ninja Multi-Config" -c user.mp-units.build:all=False \
-                         ${{ matrix.conan-config }}
+                         ${{ matrix.conan-args }}
       - name: Obtain package reference
         id: get-package-ref
         shell: bash
@@ -208,7 +208,7 @@ jobs:
           echo "**Local repro** (in the provided '.devcontainer' or GitHub CodeSpaces environment):" >> $GITHUB_STEP_SUMMARY
           echo '```sh' >> $GITHUB_STEP_SUMMARY
           [ "${{ matrix.toolchain.compiler.type }}" != "MSVC" ] && ALL="True" || ALL="False"
-          echo "conan create . -b mp-units/* -b missing ${{ matrix.conan-settings }} -c user.mp-units.build:all=${ALL} ${{ matrix.conan-config }}" >> $GITHUB_STEP_SUMMARY
+          echo "conan create . -b mp-units/* -b missing ${{ matrix.conan-settings }} -c user.mp-units.build:all=${ALL} ${{ matrix.conan-args }}" >> $GITHUB_STEP_SUMMARY
           echo '```' >> $GITHUB_STEP_SUMMARY
 
     outputs:
diff --git a/.github/workflows/ci-freestanding.yml b/.github/workflows/ci-freestanding.yml
index fcbe194ab9..86b4226bc6 100644
--- a/.github/workflows/ci-freestanding.yml
+++ b/.github/workflows/ci-freestanding.yml
@@ -162,7 +162,7 @@ jobs:
           conan build . -b missing ${{ matrix.conan-settings }} \
                         -c tools.cmake.cmaketoolchain:generator="Ninja Multi-Config" \
                         -c user.mp-units.build:all=True \
-                        ${{ matrix.conan-config }}
+                        ${{ matrix.conan-args }}
       - name: Clean Conan cache before backup
         shell: bash
         run: |
@@ -178,5 +178,5 @@ jobs:
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "**Local repro** (in the provided '.devcontainer' or GitHub CodeSpaces environment):" >> $GITHUB_STEP_SUMMARY
           echo '```sh' >> $GITHUB_STEP_SUMMARY
-          echo "conan build . -b missing ${{ matrix.conan-settings }} -c user.mp-units.build:all=True ${{ matrix.conan-config }}" >> $GITHUB_STEP_SUMMARY
+          echo "conan build . -b missing ${{ matrix.conan-settings }} -c user.mp-units.build:all=True ${{ matrix.conan-args }}" >> $GITHUB_STEP_SUMMARY
           echo '```' >> $GITHUB_STEP_SUMMARY
diff --git a/.github/workflows/ci-test-package-cmake.yml b/.github/workflows/ci-test-package-cmake.yml
index 7de13c9b39..9efca6a516 100644
--- a/.github/workflows/ci-test-package-cmake.yml
+++ b/.github/workflows/ci-test-package-cmake.yml
@@ -174,7 +174,7 @@ jobs:
         run: |
           conan install . -b missing ${{ matrix.conan-settings }} \
                           -c tools.cmake.cmaketoolchain:generator="Ninja Multi-Config" \
-                          -c user.mp-units.build:all=False ${{ matrix.conan-config }}
+                          -c user.mp-units.build:all=False ${{ matrix.conan-args }}
       - name: Provide dependencies for the build
         shell: bash
         working-directory: src
@@ -290,7 +290,7 @@ jobs:
             BUILD_TYPE_LOWER=$(echo "${{ matrix.build_type }}" | tr '[:upper:]' '[:lower:]')
             echo '```sh' >> $GITHUB_STEP_SUMMARY
             echo "echo 'tools.cmake.cmake_layout:build_folder_vars=[\"settings.compiler\", \"settings.compiler.version\", \"settings.compiler.cppstd\"]' >> ~/.conan2/global.conf" >> $GITHUB_STEP_SUMMARY
-            echo "conan install . -b missing ${{ matrix.conan-settings }} -c user.mp-units.build:all=False ${{ matrix.conan-config }}" >> $GITHUB_STEP_SUMMARY
+            echo "conan install . -b missing ${{ matrix.conan-settings }} -c user.mp-units.build:all=False ${{ matrix.conan-args }}" >> $GITHUB_STEP_SUMMARY
             echo "echo '{\"version\":4,\"include\":[\"../CMakeUserPresets.json\"]}' > src/CMakeUserPresets.json" >> $GITHUB_STEP_SUMMARY
             echo "echo '{\"version\":4,\"include\":[\"../CMakeUserPresets.json\"]}' > test_package/CMakeUserPresets.json" >> $GITHUB_STEP_SUMMARY
             echo "(cd src && source ../build/${{ matrix.conan-build-folder }}/generators/conanbuild.sh && cmake --preset conan-${{ matrix.conan-build-folder }} -DCMAKE_INSTALL_PREFIX=../out && cmake --build --preset conan-${{ matrix.conan-build-folder }}-${BUILD_TYPE_LOWER} --target install)" >> $GITHUB_STEP_SUMMARY