backport PR merged to fix python detection
https://github.com/mborgerding/kissfft/pull/119.patch
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -53,8 +53,8 @@ if(KISSFFT_DATATYPE MATCHES "^simd$")
     endif()
 endif()
 
-find_package(Python REQUIRED)
-add_test(NAME testkiss.py COMMAND "${PYTHON_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/testkiss.py")
+find_package(Python3 COMPONENTS Interpreter REQUIRED)
+add_test(NAME testkiss.py COMMAND "${Python3_INTERPRETER}" "${CMAKE_CURRENT_SOURCE_DIR}/testkiss.py")
 list(APPEND TESTKISS_PY_ENV "KISSFFT_DATATYPE=${KISSFFT_DATATYPE}")
 list(APPEND TESTKISS_PY_ENV "KISSFFT_OPENMP=${KISSFFT_OPENMP}")
 set_tests_properties(testkiss.py PROPERTIES