try as additional command line define...

Author: lgray

.github/workflows/ci.yml

@@ -173,14 +173,13 @@ jobs:
           CIBW_BUILD_VERBOSITY: 2
           CIBW_CONFIG_SETTINGS_WINDOWS: >
             "cmake.define.GMP_DLL_TO_COPY"="C:\\vcpkg\\packages\\gmp_x64-windows\\bin\\gmp-10.dll"
+            "cmake.define.unofficial-getopt-win32_DIR"="C:\\vcpkg\\packages\\getopt-win32_x64-windows\\share\\unofficial-getopt-win32"
           CIBW_ENVIRONMENT_WINDOWS: >
             CGAL_DIR='C:\vcpkg\packages\cgal_x64-windows\share\cgal'
             GMP_INC_DIR='C:\vcpkg\packages\gmp_x64-windows\include'
             GMP_LIB_DIR='C:\vcpkg\packages\gmp_x64-windows\lib'
             MPFR_INC_DIR='C:\vcpkg\packages\mpfr_x64-windows\include'
             MPFR_LIB_DIR='C:\vcpkg\packages\mpfr_x64-windows\lib'
-            CMAKE_PREFIX_PATH+=';C:\vcpkg\packages\getopt-win32_x64-windows\share\unofficial-getopt-win32'
-
 
       - name: Upload wheels
         uses: actions/upload-artifact@v4