From https://src.fedoraproject.org/rpms/google-cpu_features/blob/rawhide/f/google-cpu_features-unbundle_gtest.patch

--- cpu_features-0.9.0.old/CMakeLists.txt	2023-09-14 13:15:33.000000000 +0100
+++ cpu_features-0.9.0.new/CMakeLists.txt	2024-03-25 09:46:42.619143407 +0000
@@ -215,39 +215,7 @@
   set(CMAKE_CXX_EXTENSIONS OFF) # prefer use of -std14 instead of -gnustd14
 
   if(NOT TARGET gtest OR NOT TARGET gmock_main)
-    # Download and unpack googletest at configure time.
-    configure_file(
-      cmake/googletest.CMakeLists.txt.in
-      googletest-download/CMakeLists.txt
-    )
-
-    execute_process(
-      COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
-      RESULT_VARIABLE result
-      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download)
-
-    if(result)
-      message(FATAL_ERROR "CMake step for googletest failed: ${result}")
-    endif()
-
-    execute_process(
-      COMMAND ${CMAKE_COMMAND} --build .
-      RESULT_VARIABLE result
-      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download)
-
-    if(result)
-      message(FATAL_ERROR "Build step for googletest failed: ${result}")
-    endif()
-
-    # Prevent overriding the parent project's compiler/linker settings on
-    # Windows.
-    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
-
-    # Add googletest directly to our build. This defines the gtest and
-    # gtest_main targets.
-    add_subdirectory(${CMAKE_BINARY_DIR}/googletest-src
-                     ${CMAKE_BINARY_DIR}/googletest-build
-                     EXCLUDE_FROM_ALL)
+    find_package(GTest)
   endif()
 
   add_subdirectory(test)