How to build with GTK on macOS in a way the app actually works?

[barracuda156]

Could you say how to build with GTK GUI? I can build the app with minimal tweaks, but it does not work, crashing on launch.

% /Applications/MacPorts/eiskaltdcpp/eiskaltdcpp.app/Contents/MacOS/eiskaltdcpp
Loading: Hash database
Loading: Shared Files
Loading: Download Queue
Loading: Users
Installing handler for: Segmentation fault
Installing handler for: Abort trap
Installing handler for: Bus error
Installing handler for: Terminated
Signal handlers installed.
eiskaltdcpp.app/Contents/Resources/gtk is inaccessible, falling back to current directory instead.
GTKBUILDER ERROR file => ./ui/mainwindow.ui ,
 => Failed to open file “./ui/mainwindow.ui”: No such file or directory
(eiskaltdcpp:32261): Gtk-CRITICAL **: 08:53:41.502: gtk_main_quit: assertion 'main_loops != NULL' failed

(eiskaltdcpp:32261): Gtk-CRITICAL **: 08:53:41.502: gtk_window_set_role: assertion 'GTK_IS_WINDOW (window)' failed
Catching signal : Segmentation fault

Linking to libraries looks fine, bundle structure looks sane too, but the thing is still broken.