When I try to compile the menu_test.d test for fltk4d, I get a bunch of link errors:

$ rebuild menu_test.d
WARNING: Module menu_test.d does not have a module declaration. This can cause problems
         with rebuild's -oq option. If an error occurs, fix this first.
/usr/bin/ld: Undefined symbols:
_D_fl_define_FL_EMBOSSED_LABEL
_DFl_Adjuster_baseDraw
_DFl_Adjuster_delete
_DFl_Adjuster_new
_DFl_Adjuster_soft
_DFl_Valuator_changed
_DFl_Valuator_clamp
_DFl_Valuator_clear_changed
...
collect2: ld returned 1 exit status

I am using rebuild, I am on a G4 Mac.