Import module

[codenstuff via Digitalmars-d-learn]

I am trying to import module and compile.

The compiler produces message

map/map.d(9): Error: module game_object is in file 
'steering/game_object.d' which cannot be read
import path[0] = /usr/include/dmd/phobos
import path[1] = /usr/include/dmd/druntime/import
make: *** [main] Error 1

How can I compile? Is it possible to modify import path?

Modules are set up as

${HOME}/d_apps/steering (contains steering/game_object.d)
${HOME}/d_apps/path_find (contains map/map.d)

In map.d I import as

import steering.game_object;

The compile command

dmd map/map.d main_visual.d -I${HOME}/d_apps/steering