Fix Windows CMAKE_PREFIX_PATH path format and add debug output

Author: jeongseok-meta

.github/workflows/cibuildwheel.yml

@@ -51,8 +51,15 @@ jobs:
         if: runner.os != 'Linux'
         run: |
           pixi install -e default
-          echo "CMAKE_PREFIX_PATH=$PWD/.pixi/envs/default" >> $GITHUB_ENV
+          # Convert path to native format for Windows
+          if [ "$RUNNER_OS" == "Windows" ]; then
+            CMAKE_PREFIX_PATH=$(cygpath -w "$PWD/.pixi/envs/default")
+          else
+            CMAKE_PREFIX_PATH="$PWD/.pixi/envs/default"
+          fi
+          echo "CMAKE_PREFIX_PATH=$CMAKE_PREFIX_PATH" >> $GITHUB_ENV
           echo "CONDA_PREFIX=$PWD/.pixi/envs/default" >> $GITHUB_ENV
+          echo "Debug: Set CMAKE_PREFIX_PATH=$CMAKE_PREFIX_PATH"
         shell: bash
 
       - name: Build wheels

pyproject-pypi.toml.j2

@@ -278,6 +278,8 @@ environment = { MOMENTUM_BUILD_WITH_FBXSDK = "OFF" }
 build-frontend = "pip; args: --no-build-isolation"
 # Install build dependencies before building (since we disabled build isolation)
 before-build = """
+echo Debug: CMAKE_PREFIX_PATH=%CMAKE_PREFIX_PATH%
+dir %CMAKE_PREFIX_PATH%\\Library\\lib\\cmake\\Ceres 2>nul || echo Ceres cmake dir not found
 pip install scikit-build-core pybind11 setuptools-scm
 pip install "torch>=2.8.0,<2.9" --index-url https://download.pytorch.org/whl/cpu
 """