Another try.

Author: asmorkalov

.github/workflows/build_wheels_windows.yml

@@ -60,25 +60,23 @@ jobs:
       uses: microsoft/setup-msbuild@v1.1
     - name: Setup NASM
       uses: ilammy/setup-nasm@v1
-    - name: Get OpenBLAS
+      working-directory: ${{ github.workspace }}
+    - name: Build a package
+      # CMake 3.25 regression fix. See https://stackoverflow.com/questions/74162633/problem-compiling-from-source-opencv-with-mvsc2019-in-64-bit-version
       run: |
         mkdir openblas
         cd openblas
         curl -o OpenBLAS-0.3.30.zip -L https://github.com/OpenMathLib/OpenBLAS/releases/download/v0.3.30/OpenBLAS-0.3.30-${{ matrix.platform }}.zip
         unzip OpenBLAS-0.3.30.zip
         pwd
         dir
-      shell: cmd
-      working-directory: ${{ github.workspace }}
-    - name: Build a package
-      # CMake 3.25 regression fix. See https://stackoverflow.com/questions/74162633/problem-compiling-from-source-opencv-with-mvsc2019-in-64-bit-version
-      run: |
+        cd ..
         python --version
         python -m pip install --upgrade pip
         python -m pip install --upgrade setuptools
         python -m pip install cmake==3.24.2
         python -m pip install toml && python -c "import toml; c = toml.load('pyproject.toml'); print('\n'.join(c['build-system']['requires']))" >> requirements.txt | python -m pip install -r requirements.txt
-        set "CI_BUILD=1" && python setup.py bdist_wheel --py-limited-api=cp37 --dist-dir=%cd%\wheelhouse -v
+        set "CI_BUILD=1" && set "OpenBLAS_HOME=${{ github.workspace }}\openblas" && python setup.py bdist_wheel --py-limited-api=cp37 --dist-dir=%cd%\wheelhouse -v
       shell: cmd
       working-directory: ${{ github.workspace }}
     - name: Saving all wheels