Well, don't worry too much about those warnings.
GTK programs are expecting Gnome icons or themes. I use a Python programs with this dependency path: wxPython >wxWidgets>GTK3
I do get a lot of those warnings, because I use KDE with unusual theme. 

On Sun, Jan 26, 2020 at 8:33 PM Sven Schreiber <svetosch@gmx.net> wrote:
Hi,
I'm currently trying out gretl on a Ubuntu 19.10 installation serving
the screen via Broadway (browser-based).
I see many icon warnings like this:
(gretl_x11:1191): Gtk-WARNING **: 21:28:23.825: Error loading theme icon
'help-about' for stock: Icon 'help-about' not present in theme Yaru

This is gtk3, obviously. I've seen such warnings and the missing icons
on the experimental Windows builds, but not on Linux so far (I think).

Not sure whether that's something gretl itself can solve.

thanks
sven
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