Hello Guix,

Below I've attached a draft patch to update vlc to 3.0.1, and also to
add several more inputs based on reading the output of the 'configure'
script.

It builds successfully and mostly works except for one problem: the
icons are missing from the control buttons on the main window of the Qt
interface.  The icons in question are .svg files in the source tarball,
but are converted into data structures within C++ source code using
'rcc'.

strace reveals that vlc is performing 'stat' system calls on bogus file
names beginning with ":/", e.g. ":/toolbar/play_b.svg".  These
correspond to the missing icons.  According to
<https://doc.qt.io/archives/qt-4.8/resources.html>, these names that
begin with ":/" are meant to be references to resources that were
imported using 'rcc'.

I can't afford to spend more time on this right now.  I don't use vlc
myself, but for security reasons I think it's important to keep our
media players up-to-date, especially media players like vlc that bundle
their own codecs.  I expect that vlc is quite popular, which makes it
all the more important.

I'm hoping that someone with more knowledge of Qt will step up to debug
this problem.  Any volunteers?

Note, this patch is based on core-updates, but hopefully it would work
on 'master' too.

       Mark