Request for help with writing defenition for pyxel.

[Dmitry Polyakov <polyakov@liltechdude.xyz>]

I requesting for help with writing defenition for python retro game engine[fn:1].

There are steps according to manual to build this engine[fn:2]:

1. Get sources with ~git clone https://github.com/kitao/pyxel~
2. "cd" to this dir
3. Invoke ~guix environment --pure --ad-hoc gcc make python python-pip
   coreutils findutils sdl2 sdl2-image~
4. Appnend this to in file pyxel/core/Makefile on line 50
   ~-I/gnu/store/flvzd76nb8xzbp1sf5ckkvpwhspz9fqx-sdl-union-1.2.15/include/SDL2~
5. Invoke ~make -C pyxel/core clean all~
6. Invoke ~pip3 install .~ to install this package

And I got fully functional (according to examples) package in my
system, but when I was tried to write defenition:
#+begin_src scheme
(define-public python-pyxel
  (package
   (name "python-pyxel")
   (version "1.4.3")
   (source
    (origin
     (method url-fetch)
     (uri "file:///home/lil/src/ring/pyxel" ;; this is version with modified Makefile
	  ;; (pypi-uri "pyxel" version) <- this is original content from $ guix import pypi pyxel
	  )
     (sha256
      (base32
       "1gxvagmj37gs871bh77xafm5jyiaw1hvs76wb97w96kf3g8abhkz"))))
   (build-system python-build-system)
   (inputs
    `(("gifsicle" ,gifsicle)
      ("sdl2" ,(sdl-union (list sdl2 sdl2-image)))))
   (home-page "https://github.com/kitao/pyxel")
   (synopsis "A retro game engine for Python")
   (description "A retro game engine for Python")
   (license license:expat)))
#+end_src

I was stacked with that error[fn:3]
#+begin_src bash
starting phase `build'
running "python setup.py" with command "build" and parameters ()
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "setup.py", line 2, in <module>
    from pyxel import VERSION
  File "/tmp/guix-build-python-pyxel-1.4.3.drv-0/source/pyxel/__init__.py", line 10, in <module>
    from . import core  # type: ignore
  File "/tmp/guix-build-python-pyxel-1.4.3.drv-0/source/pyxel/core/__init__.py", line 42, in <module>
    _lib = _load_library()
  File "/tmp/guix-build-python-pyxel-1.4.3.drv-0/source/pyxel/core/__init__.py", line 39, in _load_library
    return cdll.LoadLibrary(lib_path)
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/ctypes/__init__.py", line 451, in LoadLibrary
    return self._dlltype(name)
  File "/gnu/store/9w9jvy3bgjg4qaqmrij01nbppiccqr7c-python-3.8.2/lib/python3.8/ctypes/__init__.py", line 373, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libSDL2-2.0.so.0: cannot open shared object file: No such file or directory
command "python" "-c" "import setuptools, tokenize;__file__='setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\\r\\n', '\\n');f.close();exec(compile(code, __file__, 'exec'))" "build" failed with status 1
builder for `/gnu/store/2v3wlpjg2mg3mllc4qkb22b34cmymiab-python-pyxel-1.4.3.drv' failed with exit code 1
build of /gnu/store/2v3wlpjg2mg3mllc4qkb22b34cmymiab-python-pyxel-1.4.3.drv failed
View build log at '/var/log/guix/drvs/2v/3wlpjg2mg3mllc4qkb22b34cmymiab-python-pyxel-1.4.3.drv.bz2'.
guix build: error: build of `/gnu/store/2v3wlpjg2mg3mllc4qkb22b34cmymiab-python-pyxel-1.4.3.drv' failed
#+end_src

As far as I can understand, firstly guix should build C++ dependencies
and /then/ install python package. Isn't it? But I don't know how to do
this.

* Footnotes

[fn:1] https://github.com/kitao/pyxel Actually is C++ and Python engine

[fn:2] https://github.com/kitao/pyxel#execute-the-following-command-in-any-folder

[fn:3] For full error see https://pastebin.com/d18Wrrq4


-- 
魔法少女リルテチヅデですよ。