$ pip install slycot
Defaulting to user installation because normal site-packages is not writeable
Collecting slycot
  Using cached slycot-0.3.5.0.tar.gz (1.5 MB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Collecting numpy
  Using cached numpy-1.18.4-cp38-cp38-manylinux1_x86_64.whl (20.7 MB)
Building wheels for collected packages: slycot
  Building wheel for slycot (PEP 517) ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/local/bin/python /usr/local/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /tmp/tmprwu6q9xf
       cwd: /tmp/pip-install-djjch8io/slycot
  Complete output (84 lines):
  Not searching for unused variables given on the command line.
  CMake Error: CMake was unable to find a build program corresponding to "Ninja".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
  -- Configuring incomplete, errors occurred!
  See also "/tmp/pip-install-djjch8io/slycot/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  Not searching for unused variables given on the command line.
  -- The C compiler identification is GNU 8.3.0
  -- Check for working C compiler: /usr/bin/cc
  -- Check for working C compiler: /usr/bin/cc - works
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- The Fortran compiler identification is unknown
  CMake Error at CMakeLists.txt:4 (ENABLE_LANGUAGE):
    No CMAKE_Fortran_COMPILER could be found.

    Tell CMake where to find the compiler by setting either the environment
    variable "FC" or the CMake cache entry CMAKE_Fortran_COMPILER to the full
    path to the compiler, or to the compiler name if it is in the PATH.


  -- Configuring incomplete, errors occurred!
  See also "/tmp/pip-install-djjch8io/slycot/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  See also "/tmp/pip-install-djjch8io/slycot/_cmake_test_compile/build/CMakeFiles/CMakeError.log".


  --------------------------------------------------------------------------------
  -- Trying "Ninja" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "Ninja" generator - failure
  --------------------------------------------------------------------------------



  --------------------------------------------------------------------------------
  -- Trying "Unix Makefiles" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "Unix Makefiles" generator - failure
  --------------------------------------------------------------------------------

  ********************************************************************************
  scikit-build could not get a working generator for your system. Aborting build.

  Building Linux wheels for Python 3.8 requires a compiler (e.g gcc).
  It can be installed using debian package manager:

    sudo apt-get install build-essential

  To build compliant wheels, consider using the manylinux system described in PEP-513.
  Get it with "dockcross/manylinux-x64" docker image:

    https://github.com/dockcross/dockcross#readme

  For more details, please refer to scikit-build documentation:

    http://scikit-build.readthedocs.io/en/latest/generators.html#linux

  ********************************************************************************
  ----------------------------------------
  ERROR: Failed building wheel for slycot
Failed to build slycot
ERROR: Could not build wheels for slycot which use PEP 517 and cannot be installed directly