Re: I have python39-devel, but in a build of several extensions the build process cannot find Python.h.

On 17/05/2026 20:23, Soren via Cygwin-apps wrote:
> As I wrote in the Subject:... so, setup shows me that I have the
> development package with headers, and so does cygcheck. I am not the author
> working on python extensions, they are extensions from PyPi that are
> building under pip.  Typical error is like so:
> 
>    × Building wheel for brotli (pyproject.toml) did not run successfully.
>    │ exit code: 1
>    ╰─> [28 lines of output]
> 
> /cygdrive/c/Users/somia/AppData/Local/Temp/pip-build-env-p1c92lq2/overlay/lib/python3.12/site-packages/setuptools/_distutils/dist.py:287:
> UserWarning: Unknown distribution option: 'test_suite'
>          warnings.warn(msg)
>        running bdist_wheel
>        running build
>        running build_py
>        creating bin/lib.cygwin-3.6.9-x86_64-cpython-312
>        copying python/brotli.py -> bin/lib.cygwin-3.6.9-x86_64-cpython-312
>        running build_ext
>        <string>:82: DeprecationWarning: dep_util is Deprecated. Use
> functions from setuptools instead.
>        building '_brotli' extension
>        creating bin/temp.cygwin-3.6.9-x86_64-cpython-312/python
>        creating bin/temp.cygwin-3.6.9-x86_64-cpython-312/c/common
>        creating bin/temp.cygwin-3.6.9-x86_64-cpython-312/c/dec
>        creating bin/temp.cygwin-3.6.9-x86_64-cpython-312/c/enc
>        gcc -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall
> -Ic/include
> -I/cygdrive/c/Users/somia/local/share/python-venv/beleriand/include
> -I/usr/include/python3.12 -c python/_brotli.c -o
> bin/temp.cygwin-3.6.9-x86_64-cpython-312/python/_brotli.o
>        python/_brotli.c:7:10: fatal error: Python.h: No such file or
> directory
>            7 | #include <Python.h>
>              |          ^~~~~~~~~~
>        compilation terminated.

you need python312-devel as you are using 3.12