Python module build issue

[tkornack]

I'm trying to build the python module from source (master). I'm using Ubuntu 25.10 (arm) and the main horizon app seems to build perfectly. I'm using meson compile horizon.so -C build and getting an error horizon.so: target not found.

The meson setup output notably shows this line:
Run-time dependency py3cairo found: NO (tried pkgconfig and cmake)
is that derailing it? I've installed libcairo2-dev and pycairo in python. the name py3cairo specifically seems to be an rpm package?

Once I figure it out I'll contribute an update to the python module documentation page. Any tips are welcome.

[carrotIndustries]

See https://github.com/horizon-eda/horizon/blob/8c4c3a8774ca128d311827ebadf6bf0f62ed1710/.github/workflows/all.yml#L93C27-L93C45, try installing python3-cairo-dev

[Chiam-ii]

To resolve these issues, try the following steps:

1. For the horizon.so: target not found error:
   Double-check your Meson setup. Ensure you ran meson setup build correctly and that the horizon.so target is defined in the Meson build files. You might need to verify the build configuration or check for typos in the target name.

2. For the py3cairo dependency issue:
   On Ubuntu (a Debian-based distro), py3cairo isn’t an RPM package. Instead, make sure you have the correct development packages. Even though you installed libcairo2-dev and pycairo, Meson might be looking for py3cairo via pkg-config. Run pkg-config --cflags --libs py3cairo to check if it’s detectable. If not, reinstall python3-cairo-dev (or a similar package specific to Ubuntu 25.10 for Python 3 Cairo development) and ensure your Python environment can access pycairo properly.

Also, confirm that all other build dependencies for the Python module are installed. You can cross-reference the project’s documentation or meson.build files to identify any missing libraries or packages. If issues persist, checking the project’s issue tracker or reaching out to its maintainers for Ubuntu 25.10 (arm) specific guidance would be helpful.

[carrotIndustries]

To resolve these issues, try the following steps:

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