config/autoconf.mk TK_MOTIF_LIBS should be TK_LIBS, so you don't have write logic in your makefiles that says "If I'm Motif then use this one". Just link in TK_LIBS and be done with it. Other variables need to be reamed like this too, just picking on TK_MOTIF_LIBS.

I'm on this.

I checked in a fix. TK_MOTIF_CFLAGS and TK_GTK_CFLAGS are now just TK_CFLAGS. TK_MOTIF_LIBS and TK_GTK_LIBS are now just TK_LIBS.