try I

Author: galabovaa

.github/workflows/hipo-win-vcpkg.yml

@@ -36,7 +36,8 @@ jobs:
         # run: ls C:/vcpkg/packages/metis_x64-windows/
         # run: ls C:/vcpkg/packages/metis_x64-windows/lib
         # run: ls C:/vcpkg/packages/metis_x64-windows/share
-        # run: ls C:/vcpkg/packages/gklib_x64-windows/share/gklib
+      - name: LS 
+        run: ls C:/vcpkg/packages/gklib_x64-windows/share/gklib
 
       - name: Install OpenBLAS
         run: vcpkg install openblas
@@ -51,7 +52,7 @@ jobs:
           cmake $GITHUB_WORKSPACE \
           -DHIPO=ON \
           -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake
-          -DCMAKE_CXX_FLAGS="-I C:/vcpkg/packages/gklib_x64-windows/include/GKlib"
+          -DCMAKE_CXX_FLAGS="-IC://vcpkg//packages//gklib_x64-windows//include//GKlib"
 
       - name: Build 
         shell: bash