meson can't find python3 dep

[soredake]

Short log.

Configuring ratbagctl.test using configuration
Program /var/tmp/portage/dev-libs/libratbag-9999/work/libratbag-9999-build/ratbagctl.test found: YES (/var/tmp/portage/dev-libs/libratbag-9999/work/libratbag-9999-build/ratbagctl.test)
Configuring toolbox.py using configuration
Configuring config.h using configuration
Program swig found: YES (/usr/bin/swig)
Dependency python3 found: NO

Meson encountered an error in file meson.build, line 536, column 0:
Dependency "python3" not found

Latest meson from git. Gentoo amd64 stable, trying to build https://github.com/libratbag/libratbag from git.
meson_log.zip
build.log

https://github.com/libratbag/libratbag/blob/575b7bce98800efc11bd2e7ecf065aced391580d/meson.build#L544

There is no python3 module on gentoo

❯ pkg-config --list-all | grep python
python-2.7                          Python - Python library
python-3.4                          Python - Python library
python-3.4m                         Python - Python library

Should i report it to gentoo or somewhere else?

[whot]

This is a python3 packaging issue in Gentoo. From Fedora:

$> rpm -ql python3-devel
...
/usr/lib64/pkgconfig/python-3.6.pc
/usr/lib64/pkgconfig/python-3.6m.pc
/usr/lib64/pkgconfig/python3.pc
...

i.e. Fedora's python3-devel package ships both the generic python3.pc and the python-3.6.pc pkgconfig files. For most applications that don't rely on a specific python version, checking for python3 is enough.

[soredake]

Reported https://bugs.gentoo.org/634856