--- a/cpp/cmake_modules/FindPython3Alt.cmake
+++ b/cpp/cmake_modules/FindPython3Alt.cmake
@@ -23,6 +23,7 @@
 # - PYTHON_OTHER_LIBS
 # - NUMPY_INCLUDE_DIRS
 
+if(FALSE)
 # Need CMake 3.15 or later for Python3_FIND_STRATEGY
 if(${CMAKE_VERSION} VERSION_LESS "3.15.0")
   # Use deprecated Python- and NumPy-finding code
@@ -69,6 +70,7 @@
 set(PYTHON_OTHER_LIBS)
 
 get_target_property(NUMPY_INCLUDE_DIRS Python3::NumPy INTERFACE_INCLUDE_DIRECTORIES)
+endif(FALSE)
 
 # CMake's python3_add_library() doesn't apply the required extension suffix,
 # detect it ourselves.
@@ -94,5 +96,6 @@
   set_target_properties(${name} PROPERTIES SUFFIX ${_EXT_SUFFIX})
 endfunction()
 
+include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(
   Python3Alt REQUIRED_VARS PYTHON_EXECUTABLE PYTHON_INCLUDE_DIRS NUMPY_INCLUDE_DIRS)