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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Fails while building dependencies, since the runner can't find the include path","articleBody":"**Description:**\r\nI have a workflow that builds and test my Python project. In poetry installation steps `gcc` can't find the Python header/s and the build fails. When I checked the `/opt/hostedtoolcache/Python/3.8.13/x64/include/python3.8`, there is no such directory. \r\n\r\n**Action version:**\r\n4\r\n\r\n**Platform:**\r\n- [x] Ubuntu\r\n- [ ] macOS\r\n- [ ] Windows\r\n\r\n**Runner type:**\r\n- [ ] Hosted\r\n- [x] Self-hosted\r\n\r\n**Tools version:**\r\n3.7.13\r\n3.8.13\r\n\r\n**Repro steps:**  \r\n```yaml\r\njobs:\r\n  test:\r\n    runs-on: [self-hosted, xxxx]\r\n    strategy:\r\n      fail-fast: false\r\n      matrix:\r\n        python-version: [3.7, 3.8]\r\n    name: flake8 and pytest on Python ${{ matrix.python-version }}\r\n    steps:\r\n      - uses: actions/checkout@v3\r\n        with:\r\n          token: ${{ secrets.PERSONAL_GITHUB_TOKEN }}\r\n          fetch-depth: 0\r\n\r\n      - name: Set up Python ${{ matrix.python-version }}\r\n        id: setup-python\r\n        uses: actions/setup-python@v4\r\n        with:\r\n          python-version: ${{ matrix.python-version }}-dev # also tried without dev \r\n          update-environment: true # also tried without this line.\r\n\r\n      - name: Setup Poetry\r\n        run: |\r\n          curl -sSL https://install.python-poetry.org | POETRY_VERSION=1.1.14 python${{ matrix.python-version }}\r\n\r\n      - name: Load cached poetry packages\r\n        id: cached-poetry-dependencies\r\n        uses: actions/cache@v2\r\n        with:\r\n          path: .venv\r\n          key: poetry-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}\r\n\r\n      - name: Poetry install python packages\r\n        run: |\r\n          CPATH=$pythonLocation/include/python${{ matrix.python-version }}m\r\n          echo \"CPATH=$CPATH\" >> $GITHUB_ENV\r\n          poetry env use ${{ matrix.python-version }}\r\n          poetry install --no-interaction\r\n        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'\r\n```\r\n\r\n**Expected behavior:**\r\nInstalled dependencies.\r\n\r\n**Actual behavior:**\r\nError: \r\n```bash\r\nCPATH=$pythonLocation/include/python3.7\r\n  echo \"CPATH=$CPATH\" >> $GITHUB_ENV\r\n  poetry install --no-interaction --no-dev\r\n  shell: /bin/bash -e {0}\r\n  env:\r\n    pythonLocation: /home/***/actions-runner/_work/_tool/Python/3.7.13/x64\r\n    PKG_CONFIG_PATH: /home/***/actions-runner/_work/_tool/Python/3.7.13/x64/lib/pkgconfig\r\n    Python_ROOT_DIR: /home/***/actions-runner/_work/_tool/Python/3.7.13/x64\r\n    Python2_ROOT_DIR: /home/***/actions-runner/_work/_tool/Python/3.7.13/x64\r\n    Python3_ROOT_DIR: /home/***/actions-runner/_work/_tool/Python/3.7.13/x64\r\n    LD_LIBRARY_PATH: /home/***/actions-runner/_work/_tool/Python/3.7.13/x64/lib \r\n...\r\ngcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -I/tmp/pip-build-env-7iw6i3c7/overlay/lib/python3.8/site-packages/numpy/core/include -I./common -I/home/***/actions-runner/_work/datapipeline/datapipeline/.venv/include -I/opt/hostedtoolcache/Python/3.8.13/x64/include/python3.8 -c ./common/maskApi.c -o build/temp.linux-x86_64-cpython-38/./common/maskApi.o -Wno-cpp -Wno-unused-function -std=c99\r\npycocotools/_mask.c:6:10: fatal error: Python.h: No such file or directory\r\n         #include \"Python.h\"\r\n                        ^~~~~~~~~~\r\n        compilation terminated.\r\n...\r\n","author":{"url":"https://github.com/blgnksy","@type":"Person","name":"blgnksy"},"datePublished":"2022-09-23T10:18:30Z","url":"https://github.com/actions/setup-python/issues/507"}