Can't compile CMake Error at TinyInst/third_party/CMakeLists.txt

[RadCet]

I have some trouble while compiling project:

CMake Error at TinyInst/third_party/CMakeLists.txt:20 (find_package):
  By not providing "FindPython3.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Python3", but
  CMake did not find one.

  Could not find a package configuration file provided by "Python3" with any
  of the following names:

    Python3Config.cmake
    python3-config.cmake

  Add the installation prefix of "Python3" to CMAKE_PREFIX_PATH or set
  "Python3_DIR" to a directory containing one of the above files.  If
  "Python3" provides a separate development package or SDK, be sure it has
  been installed.


-- Configuring incomplete, errors occurred!

When I edit CMakeLists to:

#find_package (Python3 REQUIRED) #old
find_package(PythonLibs 3) #new

Everything is ok now. Don't know if this make any different to project's features. Hope this help