The host build portion using sys/msdos/Makefile1.cross) was failing because it
was attempting to compile the generated tile.o which is using hack.h.
gcc -o../util/tilemap host_o/tilemap.o
A new ../src/tile.c has been created
gcc -c -O -I../include -I../sys/msdos -DDLB -DUSE_TILES -DCROSSCOMPILE -DCROSSCOMPILE_HOST -ohost_o/tile.o ../src/tile.c
In file included from ../include/hack.h:201:0,
from ../src/tile.c:3:
../include/dungeon.h:70:5: error: unknown type name ‘lua_State’
lua_State *themelua; /* themerms compiled lua */
^
../sys/msdos/Makefile1.cross:286: recipe for target 'host_o/tile.o' failed
make: *** [host_o/tile.o] Error 1
I don't think think the tile.o is required on the host build build portion,
so it is probably an error in the Makefile. Try removing it.