linking fails / icon broken in window maker / gorm

Hi

I have reported this bug report against WindowMaker, however I'm not 
sure if it's their fault or GNUsteps'
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=908512

When I try to build ModPlugPlay.app (to link it against 
libopenmpt-modplug-dev+libao-dev instead libmodplug-dev),
I'm getting linking errors like:

# gs_make
This is gnustep-make 2.7.0. Type 'make print-gnustep-make-help' for 
help.
Making all for app ModPlugPlay...
  Linking app ModPlugPlay ...
/usr/bin/ld: ./obj/ModPlugPlay.obj/main.m.o: in function `main':
/home/alex/debian/ModPlugPlay.app/ModPlugPlay.app-1.8/main.m:37: 
undefined reference to `ModPlug_GetSettings'
/usr/bin/ld: ./obj/ModPlugPlay.obj/Controller.m.o: in function 
`_i_Controller__forward_':
/home/alex/debian/ModPlugPlay.app/ModPlugPlay.app-1.8/Controller.m:247: 
undefined reference to `ModPlug_Seek'
/usr/bin/ld: ./obj/ModPlugPlay.obj/Controller.m.o: in function 
`_i_Controller__backward_':
/home/alex/debian/ModPlugPlay.app/ModPlugPlay.app-1.8/Controller.m:258: 
undefined reference to `ModPlug_Seek'
/usr/bin/ld: ./obj/ModPlugPlay.obj/Controller.m.o: in function 
`_i_Controller__continuePlay':
/home/alex/debian/ModPlugPlay.app/ModPlugPlay.app-1.8/Controller.m:276: 
undefined reference to `ModPlug_Read'
/usr/bin/ld: 
/home/alex/debian/ModPlugPlay.app/ModPlugPlay.app-1.8/Controller.m:277: 
undefined reference to `ao_play'
/usr/bin/ld: ./obj/ModPlugPlay.obj/Controller.m.o: in function 
`_i_Controller__nextSong_':
/home/alex/debian/ModPlugPlay.app/ModPlugPlay.app-1.8/Controller.m:85: 
undefined reference to `ModPlug_Unload'

You can find the source to retry at:
https://github.com/alexmyczko/ModPlugPlay.app

I'm also having troubles with the resources (no matter wether they are 
.tiff or .png, they get displayed wrong/not in
Gorm)

Best,