Issue with fem.functionspace in dolfinx0.8.0

I am completely new to FEnics. I am trying to run notebooks available in the documentation section. I keep running into the same error when it comes to compiling fem.functionspace with dolfinx0.8.0

V = fem.functionspace(domain, ("Lagrange", 2, (domain.geometry.dim, )))

The error is as follows

In file included from libffcx_elements_accbcf8c020d45b2cf553991d906c6f33b8b92e9.c:50:
/usr/include/python3.10/pyconfig.h:3:12: fatal error: x86_64-linux-gnu/python3.10/pyconfig.h: No such file or directory
    3 | #  include <x86_64-linux-gnu/python3.10/pyconfig.h>
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
---------------------------------------------------------------------------
DistutilsExecError                        Traceback (most recent call last)
/usr/lib/python3.10/distutils/unixccompiler.py in _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts)
    116         try:
--> 117             self.spawn(compiler_so + cc_args + [src, '-o', obj] +
    118                        extra_postargs)

/usr/lib/python3.10/distutils/ccompiler.py in spawn(self, cmd)
    909     def spawn(self, cmd):
--> 910         spawn(cmd, dry_run=self.dry_run)
    911 

/usr/lib/python3.10/distutils/spawn.py in spawn(cmd, search_path, verbose, dry_run)
     90             cmd = cmd[0]
---> 91         raise DistutilsExecError(
     92               "command %r failed with exit code %s" % (cmd, exitcode))

DistutilsExecError: command '/home/sanhitauser/anaconda3/envs/fenicsx-env/bin/x86_64-conda-linux-gnu-cc' failed with exit code 1

During handling of the above exception, another exception occurred:

CompileError                              Traceback (most recent call last)
/usr/lib/python3/dist-packages/cffi/ffiplatform.py in _build(tmpdir, ext, compiler_verbose, debug)
     50             distutils.log.set_verbosity(compiler_verbose)
---> 51             dist.run_command('build_ext')
     52             cmd_obj = dist.get_command_obj('build_ext')

/usr/lib/python3.10/distutils/dist.py in run_command(self, command)
    984         cmd_obj.ensure_finalized()
--> 985         cmd_obj.run()
    986         self.have_run[command] = 1

/usr/lib/python3.10/distutils/command/build_ext.py in run(self)
    339         # Now actually compile and link everything.
--> 340         self.build_extensions()
    341 

/usr/lib/python3.10/distutils/command/build_ext.py in build_extensions(self)
    448         else:
--> 449             self._build_extensions_serial()
    450 

/usr/lib/python3.10/distutils/command/build_ext.py in _build_extensions_serial(self)
    473             with self._filter_build_errors(ext):
--> 474                 self.build_extension(ext)
    475 

/usr/lib/python3.10/distutils/command/build_ext.py in build_extension(self, ext)
    528 
--> 529         objects = self.compiler.compile(sources,
    530                                          output_dir=self.build_temp,

/usr/lib/python3.10/distutils/ccompiler.py in compile(self, sources, output_dir, macros, include_dirs, debug, extra_preargs, extra_postargs, depends)
    573                 continue
--> 574             self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
    575 

/usr/lib/python3.10/distutils/unixccompiler.py in _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts)
    119         except DistutilsExecError as msg:
--> 120             raise CompileError(msg)
    121 

CompileError: command '/home/sanhitauser/anaconda3/envs/fenicsx-env/bin/x86_64-conda-linux-gnu-cc' failed with exit code 1

During handling of the above exception, another exception occurred:

VerificationError                         Traceback (most recent call last)
/tmp/ipykernel_1071/2796255439.py in <module>
     10 L = 20.0
     11 domain = mesh.create_box(MPI.COMM_WORLD, [[0.0, 0.0, 0.0], [L, 1, 1]], [20, 5, 5], mesh.CellType.hexahedron)
---> 12 V = fem.functionspace(domain, ("Lagrange", 2, (domain.geometry.dim, )))

/usr/lib/petsc/lib/python3/dist-packages/dolfinx/fem/function.py in functionspace(mesh, element, form_compiler_options, jit_options)
    653         form_compiler_options = dict()
    654     form_compiler_options["scalar_type"] = dtype
--> 655     (ufcx_element, ufcx_dofmap), module, code = jit.ffcx_jit(
    656         mesh.comm,
    657         ufl_e,

/usr/lib/petsc/lib/python3/dist-packages/dolfinx/jit.py in mpi_jit(comm, *args, **kwargs)
     49         # Just call JIT compiler when running in serial
     50         if comm.size == 1:
---> 51             return local_jit(*args, **kwargs)
     52 
     53         # Default status (0 == ok, 1 == fail)

/usr/lib/petsc/lib/python3/dist-packages/dolfinx/jit.py in ffcx_jit(ufl_object, form_compiler_options, jit_options)
    201         r = ffcx.codegeneration.jit.compile_forms([ufl_object], options=p_ffcx, **p_jit)
    202     elif isinstance(ufl_object, ufl.AbstractFiniteElement):
--> 203         r = ffcx.codegeneration.jit.compile_elements([ufl_object], options=p_ffcx, **p_jit)
    204     elif isinstance(ufl_object, ufl.Mesh):
    205         r = ffcx.codegeneration.jit.compile_coordinate_maps([ufl_object], options=p_ffcx, **p_jit)

/usr/lib/python3/dist-packages/ffcx/codegeneration/jit.py in compile_elements(elements, options, cache_dir, timeout, cffi_extra_compile_args, cffi_verbose, cffi_debug, cffi_libraries, visualise)
    203         except Exception:
    204             pass
--> 205         raise e
    206 
    207     objects, module = _load_objects(cache_dir, module_name, names)

/usr/lib/python3/dist-packages/ffcx/codegeneration/jit.py in compile_elements(elements, options, cache_dir, timeout, cffi_extra_compile_args, cffi_verbose, cffi_debug, cffi_libraries, visualise)
    183             decl += dofmap_template.format(name=names[i * 2 + 1])
    184 
--> 185         impl = _compile_objects(
    186             decl,
    187             elements,

/usr/lib/python3/dist-packages/ffcx/codegeneration/jit.py in _compile_objects(decl, ufl_objects, object_names, module_name, options, cache_dir, cffi_extra_compile_args, cffi_verbose, cffi_debug, cffi_libraries, visualise)
    414     root_logger.handlers = [logging.StreamHandler(f)]
    415     with redirect_stdout(f):
--> 416         ffibuilder.compile(tmpdir=cache_dir, verbose=True, debug=cffi_debug)
    417     s = f.getvalue()
    418     if cffi_verbose:

/usr/lib/python3/dist-packages/cffi/api.py in compile(self, tmpdir, verbose, target, debug)
    723             raise ValueError("set_source() must be called before compile()")
    724         module_name, source, source_extension, kwds = self._assigned_source
--> 725         return recompile(self, module_name, source, tmpdir=tmpdir,
    726                          target=target, source_extension=source_extension,
    727                          compiler_verbose=verbose, debug=debug, **kwds)

/usr/lib/python3/dist-packages/cffi/recompiler.py in recompile(ffi, module_name, preamble, tmpdir, call_c_compiler, c_file, source_extension, extradir, compiler_verbose, target, debug, **kwds)
   1562                     print('%s %r' % (msg, os.path.abspath(tmpdir)))
   1563                 os.chdir(tmpdir)
-> 1564                 outputfilename = ffiplatform.compile('.', ext,
   1565                                                      compiler_verbose, debug)
   1566             finally:

/usr/lib/python3/dist-packages/cffi/ffiplatform.py in compile(tmpdir, ext, compiler_verbose, debug)
     20     saved_environ = os.environ.copy()
     21     try:
---> 22         outputfilename = _build(tmpdir, ext, compiler_verbose, debug)
     23         outputfilename = os.path.abspath(outputfilename)
     24     finally:

/usr/lib/python3/dist-packages/cffi/ffiplatform.py in _build(tmpdir, ext, compiler_verbose, debug)
     56     except (distutils.errors.CompileError,
     57             distutils.errors.LinkError) as e:
---> 58         raise VerificationError('%s: %s' % (e.__class__.__name__, e))
     59     #
     60     return soname

VerificationError: CompileError: command '/home/sanhitauser/anaconda3/envs/fenicsx-env/bin/x86_64-conda-linux-gnu-cc' failed with exit code 1

In future, make sure to include the error message within “```”, otherwise it will be very hard to read.

The error is clearly

/usr/include/python3.10/pyconfig.h:3:12: fatal error: x86_64-linux-gnu/python3.10/pyconfig.h: No such file or directory
    3 | #  include <x86_64-linux-gnu/python3.10/pyconfig.h>
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

which means that there is something severely wrong with your python installation. It’s possible that you are missing some packages (can’t know the name for sure without any OS info, but on debian/ubuntu it would be in libpython3.10-dev).