Installing with pip failed

[illarl]

Hi,

I am trying to install the package using pip in ubuntu 25.04 using:

pip install --break-system-packages eqtools

and I get the following error:

`
x86_64-linux-gnu-gcc -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O2 -Wall -fPIC -I/tmp/pip-build-env-f6xt7leh/overlay/local/lib/python3.13/dist-packages/numpy/_core/include -I./eqtools -I/usr/include/python3.13 -c eqtools/_tricub.c -o build/temp.linux-x86_64-cpython-313/eqtools/_tricub.o
eqtools/_tricub.c:4:10: fatal error: _tricub.h: No such file or directory
4 | #include "_tricub.h"
| ^~~~~~~~~~~
compilation terminated.
error: command '/usr/bin/x86_64-linux-gnu-gcc' failed with exit code 1
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for eqtools
Failed to build eqtools
ERROR: Failed to build installable wheels for some pyproject.toml based projects (eqtools)
`
It does seem that _tricub.h is in the repository, but somehow it is not being reference correctly.

I also get an error wth the licence. It seems that it the reference should me move somewhere else:

`
Building wheel for eqtools (pyproject.toml) ... error
error: subprocess-exited-with-error

× Building wheel for eqtools (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [63 lines of output]
/tmp/pip-build-env-f6xt7leh/overlay/local/lib/python3.13/dist-packages/setuptools/config/_apply_pyprojecttoml.py:75: _MissingDynamic: license defined outside of pyproject.toml is ignored.
!!

          ********************************************************************************
          The following seems to be defined outside of `pyproject.toml`:
  
          `license = 'GPL'`
  
          According to the spec (see the link below), however, setuptools CANNOT
          consider this value unless `license` is listed as `dynamic`.
  
          https://packaging.python.org/en/latest/specifications/pyproject-toml/#declaring-project-metadata-the-project-table
  
          To prevent this problem, you can list `license` under `dynamic` or alternatively
          remove the `[project]` table from your file and rely entirely on other means of
          configuration.
          ********************************************************************************
  
  !!
    _handle_missing_dynamic(dist, project_table)
  /tmp/pip-build-env-f6xt7leh/overlay/local/lib/python3.13/dist-packages/setuptools/config/_apply_pyprojecttoml.py:82: SetuptoolsWarning: `install_requires` overwritten in `pyproject.toml` (dependencies)

`