Use Conda Python headers

Author: DimitriPapadopoulos

.github/workflows/ci.yaml

@@ -47,13 +47,24 @@ jobs:
           conda config --show-sources
           conda list --show-channel-urls
 
+      - name: Meson args - use active Python include/lib (Ubuntu)
+        if: startsWith(matrix.platform, 'ubuntu')
+        run: |
+          PY_INC=$(python -c "import sysconfig; print(sysconfig.get_config_var('INCLUDEPY'))")
+          echo "PY_INC=$PY_INC" >> $GITHUB_ENV
+          echo "MESON_SETUP_ARGS=-Dc_args=-I${PY_INC} -Dc_link_args=-L${CONDA_PREFIX}/lib" >> $GITHUB_ENV
+
       - name: Install numcodecs
         run: |
           # TODO: Remove this conditional when pcodec supports Python 3.14
           if [[ "${{ matrix.python-version }}" == "3.14" ]]; then
-            python -m pip install -v ".[test,test_extras,msgpack,google_crc32c,crc32c,zfpy]"
+            python -m pip install -v \
+              --config-settings="setup-args="${MESON_SETUP_ARGS}" \
+              ".[test,test_extras,msgpack,google_crc32c,crc32c,zfpy]"
           else
-            python -m pip install -v ".[test,test_extras,msgpack,google_crc32c,crc32c,pcodec,zfpy]"
+            python -m pip install -v \
+              --config-settings="setup-args="${MESON_SETUP_ARGS}" \
+              ".[test,test_extras,msgpack,google_crc32c,crc32c,pcodec,zfpy]"
           fi
 
       - name: List installed packages