How to package at Gentoo

[koppor]

Can following be set as default?

    operatingSystem = OperatingSystemFamily.LINUX
    architecture = MachineArchitecture.X86_64

JabRef has following report

The command ./gradlew :jabgui:jpackage ends up in a crash (probably because it is meant for Ubuntu and I’m on Gentoo).

Source: https://discourse.jabref.org/t/how-to-properly-build-from-source/9039?u=koppor

No further details.

I am guessing

target("gentoo") {
        operatingSystem = OperatingSystemFamily.LINUX
        architecture = MachineArchitecture.X86_64
        packageTypes = listOf("app-image")
    }

But I don't know