Force use system Qt on unsupported linux distros

[000exploit]

Unfortunately(or not), I'm using Gentoo and already installed all dependencies, so I want just build Vircadia client/server/other targets, but build system forces me to build Qt because System Qt is not supported on your system. Will be there something like VIRCADIA_FORCE_SYSTEM_QT of VIRCADIA_PASS_QT_BUILD env variables or similar arguments

[JulianGro]

Yes, set VIRCADIA_USE_SYSTEM_QT=true.
vircadia-builder is supposed to automate the build process as much as possible but it doesn't have a manifest for Gentoo for it to know if System Qt is supported or not.
Are you writing a manifest, or are you just building with --distro custom?

[000exploit]

Just with --distro custom, it may be impossible to write manifest for Gentoo. It's necessary to set USE flags in make.conf or any other files, so with current manifest it can't be done automatically.