Linux. Branch: llbm_ide
Command: make -f umkMakefile

In file included from ./uppsrc/CtrlCore/CtrlCore.h:49,
                 from ./uppsrc/CtrlLib/CtrlLib.h:4,
                 from ./uppsrc/RichEdit/RichEdit.h:4,
                 from ./uppsrc/ide/ide.h:4,
                 from ./uppsrc/ide/Core/Ide.cpp:1:
./uppsrc/CtrlCore/Gtk.h:12:10: fatal error: gtk/gtk.h: No such file or directory
   12 | #include <gtk/gtk.h>
      |          ^~~~~~~~~~~

umk is a console app ...