• Add missing dri dependency
• Convert sdl_ttf to RUN_DEPENDS hack, USE_LINUX=sdlttf seems to be gone
• Use brandelf(1) on installed libraries also, game runs on 12-current but on FreeBSD 10.3 execution fails with:

./libs/Dwarf_Fortress: error while loading shared libraries:
/usr/local/libexec/dwarffortress/libgraphics.so: ELF file OS ABI invalid