Build fails with waf 2.1 (Arch Linux)

[Gimmeapill]

Hi Hermann,

I came back to guitarix after a relatively long break and got a failure building from git: ... Incompatible Waf, use 2.0 ...

It turns out that waf is now at 2.1.0 on Arch and there is no easy downgrade path https://archlinux.org/packages/extra/any/waf/

Is there any easy way to fix the build the build besides a waf downgrade? If not, I'll dig out and old version, but that is probably something that will need to be fixed for the other distros at some point...