Hi Leo!

> Is cmake really needed?  I know that meson falls back to cmake if pkg-
> config fails and also supports output to cmake, but meson/ninja should
> be the default.

Yes, it is used to generate `.cmake` files inder '[out]/lib/cmake'.

> Could you try packaging those for Guix as well?

They don't have dedicated build scripts.

> As with your telegram patch, I personally think the ordering is wrong
> here.

I changed it in v8.

> You might want to regexp the middle part in case it is changed.

I could use PKGCONFIG_GETVAR\\(.+\\) but that would conflict with other 
PKGCONFIG_GETVAR lines now or in future.

> What does this achieve exactly?

It configures the build-system to install modules in output "out" 
instead of Qt's (input) path.

I have attached v8 with this email.

Regards,
RG.