trying to include CMAKE_TOOLCHAIN_FILE, still fails...

CMakeLists.txt

@@ -246,9 +246,9 @@ function(install_windows_deps)
   set(ENV{ARCH} ${ARCH})
   execute_process(
     COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/tools/setup-buildtools.cmd)
-  # set(CMAKE_TOOLCHAIN_FILE
-  # ${CMAKE_CURRENT_SOURCE_DIR}/tools/vcpkg/scripts/buildsystems/vcpkg.cmake
-  # CACHE FILEPATH "")
+  set(CMAKE_TOOLCHAIN_FILE
+  ${CMAKE_CURRENT_SOURCE_DIR}/tools/vcpkg/scripts/buildsystems/vcpkg.cmake
+  CACHE FILEPATH "")
   message(
     "Make sure that vcpkg.cmake is set as the CMAKE_TOOLCHAIN_FILE at the START of the cmake build process!
     Can be command-line arg (cmake -DCMAKE_TOOLCHAIN_FILE=...) or set in your editor of choice."
@@ -518,6 +518,7 @@ if(BUILD_TESTING)
     find_package(GTest)
     if(NOT (GTEST_FOUND OR GTest_FOUND))
       install_windows_deps()
+      include(${CMAKE_TOOLCHAIN_FILE})
       find_package(GTest REQUIRED)
     endif()
   else()