I just made an Erlang GUI "Hello World" in a Fedora 41 Toolbox.
$ toolbox create erlang
$ toolbox enter erlang
$ sudo dnf install erlang
$ erl -smp
1> wx:new().
{wx_ref,0,wx,[]}
2> M = wxMessageDialog:new(wx:null(), "Hello World").
{wx_ref,35,wxMessageDialog,[]}
3> wxMessageDialog:showModal(M).
Thanks to:
https://arifishaq.wordpress.com/wp-content/uploads/2017/12/wxerlang-getting-started.pdf