https://gitlab.gnome.org/GNOME/gtkmm/-/issues/157
--- untracked/gtk/gtkmm/aboutdialog.h.orig	2024-03-17 14:38:29
+++ untracked/gtk/gtkmm/aboutdialog.h	2024-06-02 00:27:40
@@ -124,6 +124,7 @@
   GPL_3_0,
   LGPL_2_1,
   LGPL_3_0,
+#undef BSD
   BSD,
   MIT_X11,
   ARTISTIC,