bug#26488: [PATCH] gnu: Add crawl.

[Arun Isaac]

> +               "TILES="

This disables the building of the graphical interface, if I'm not
wrong. Could you build the graphical interface as well?

> +               "BUILD_LUA="
> +               "BUILD_SQLITE="
> +               "BUILD_ZLIB="

Also, could you explain what these three BUILD_* make-flags do? Is it to
disable the use of their bundled lua, sqlite and zlib libraries? I can't
for the life of me, read and understand their Makefile. They seem to
have basically reinvented autoconf in a large hand-written Makefile.

Thanks!