Problems during the installation

[MesserLancillotto]

I have a problem installing your program via python3 running the command python3 photonslicer.py -s STLs\legocog.stl -g True -f False inside the directory after having downloaded the code with git clone --note the program's name is PhotonSlicer.py not photonslicer.py better updating the reference (it took 5 minutes for me to understand why it didn't found the program, I'm dumb I know). After running the command python3 bla bla bla I get this enormous error:

/home/lancillotto/.pyxbld/temp.linux-x86_64-3.8/pyrex/rleEncode.c:598:10: fatal error: numpy/arrayobject.h: File o directory non esistente
598 | #include "numpy/arrayobject.h"
| ^~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Traceback (most recent call last):
File "/usr/lib/python3.8/distutils/unixccompiler.py", line 117, in _compile
self.spawn(compiler_so + cc_args + [src, '-o', obj] +
File "/usr/lib/python3.8/distutils/ccompiler.py", line 910, in spawn
spawn(cmd, dry_run=self.dry_run)
File "/usr/lib/python3.8/distutils/spawn.py", line 36, in spawn
_spawn_posix(cmd, search_path, dry_run=dry_run)
File "/usr/lib/python3.8/distutils/spawn.py", line 157, in _spawn_posix
raise DistutilsExecError(
distutils.errors.DistutilsExecError: command 'gcc' failed with exit status 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3.8/site-packages/pyximport/pyximport.py", line 214, in load_module
so_path = build_module(module_name, pyxfilename, pyxbuild_dir,
File "/usr/lib/python3.8/site-packages/pyximport/pyximport.py", line 186, in build_module
so_path = pyxbuild.pyx_to_dll(pyxfilename, extension_mod,
File "/usr/lib/python3.8/site-packages/pyximport/pyxbuild.py", line 102, in pyx_to_dll
dist.run_commands()
File "/usr/lib/python3.8/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/usr/lib/python3.8/site-packages/Cython/Distutils/old_build_ext.py", line 186, in run
_build_ext.build_ext.run(self)
File "/usr/lib/python3.8/distutils/command/build_ext.py", line 340, in run
self.build_extensions()
File "/usr/lib/python3.8/site-packages/Cython/Distutils/old_build_ext.py", line 195, in build_extensions
_build_ext.build_ext.build_extensions(self)
File "/usr/lib/python3.8/distutils/command/build_ext.py", line 449, in build_extensions
self._build_extensions_serial()
File "/usr/lib/python3.8/distutils/command/build_ext.py", line 474, in _build_extensions_serial
self.build_extension(ext)
File "/usr/lib/python3.8/distutils/command/build_ext.py", line 528, in build_extension
objects = self.compiler.compile(sources,
File "/usr/lib/python3.8/distutils/ccompiler.py", line 574, in compile
self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
File "/usr/lib/python3.8/distutils/unixccompiler.py", line 120, in _compile
raise CompileError(msg)
distutils.errors.CompileError: command 'gcc' failed with exit status 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "PhotonSlicer.py", line 31, in
from Stl2Slices import *
File "/home/lancillotto/Downloads/Slicer/Stl2Slices.py", line 15, in
import rleEncode
File "/usr/lib/python3.8/site-packages/pyximport/pyximport.py", line 459, in load_module
module = load_module(fullname, self.path,
File "/usr/lib/python3.8/site-packages/pyximport/pyximport.py", line 231, in load_module
raise exc.with_traceback(tb)
File "/usr/lib/python3.8/site-packages/pyximport/pyximport.py", line 214, in load_module
so_path = build_module(module_name, pyxfilename, pyxbuild_dir,
File "/usr/lib/python3.8/site-packages/pyximport/pyximport.py", line 186, in build_module
so_path = pyxbuild.pyx_to_dll(pyxfilename, extension_mod,
File "/usr/lib/python3.8/site-packages/pyximport/pyxbuild.py", line 102, in pyx_to_dll
dist.run_commands()
File "/usr/lib/python3.8/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/usr/lib/python3.8/site-packages/Cython/Distutils/old_build_ext.py", line 186, in run
_build_ext.build_ext.run(self)
File "/usr/lib/python3.8/distutils/command/build_ext.py", line 340, in run
self.build_extensions()
File "/usr/lib/python3.8/site-packages/Cython/Distutils/old_build_ext.py", line 195, in build_extensions
_build_ext.build_ext.build_extensions(self)
File "/usr/lib/python3.8/distutils/command/build_ext.py", line 449, in build_extensions
self._build_extensions_serial()
File "/usr/lib/python3.8/distutils/command/build_ext.py", line 474, in _build_extensions_serial
self.build_extension(ext)
File "/usr/lib/python3.8/distutils/command/build_ext.py", line 528, in build_extension
objects = self.compiler.compile(sources,
File "/usr/lib/python3.8/distutils/ccompiler.py", line 574, in compile
self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
File "/usr/lib/python3.8/distutils/unixccompiler.py", line 120, in _compile
raise CompileError(msg)
ImportError: Building module rleEncode failed: ["distutils.errors.CompileError: command 'gcc' failed with exit status 1\n"] `
Suggestions about how can I fix it? Thanks a lot