mlpack error

 The target name "test" is reserved or not valid for certain CMake features,
  such as generator expressions, and may result in undefined behavior.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found Doxygen: /usr/bin/doxygen (found version "1.8.9.1")
CMake Warning at CMakeLists.txt:331 (message):
  txt2man not found; man pages will not be generated.


-- Configuring incomplete, errors occurred!
See also "/home/anonymous/mlpack-2.0.1/build/CMakeFiles/CMakeOutput.log".