bug#41555: [PATCH] gnu: xaos: Update to 4.0.

[Kei]

On Thu, 2020-05-28 at 13:55 -0400, Leo Famulari wrote:
> On Tue, May 26, 2020 at 10:10:08PM -0400, Kei Kebreau wrote:
> > * gnu/packages/maths.scm (xaos): Update to 4.0.
> > [source]: Use git-fetch.
> > [native-inputs]: Add qtbase and qttools.
> > [arguments]: Remove #:make-flags options; replace 'configure' phase
> > and add
> > 'install-data' phase.
> > [home-page]: Update URL.
> 
> LGTM, thanks Kei!

Thanks for the review! 

FYI, I added a 'make-qt-deterministic' phase which sets the environment
variable QT_RCC_SOURCE_DATE_OVERRIDE to 1 to remove a non-determinism
issue.

Anyway, this has been pushed to master as 49de32748d.