You need to define the following environment variables:

DXASDKDIR - installation path of Ebsotech IX™ SDK
DXAMAIN - development root directory
DXAOUT - output root directory

Notice that if you are working on multiple projects and the development directory root is different for each project, you may not want to define DXAMAIN in the environment, but rather define it with relative path in the top-level makefile of your projects:

export DXAMAIN = ../../..

For example, if you are compiling the software accessories for Ebsotech IX™ SDK, you should not have DXAMAIN defined.

If you have DXAMAIN defined in your environment, you can undefine it in Linux and UNIX with:

export -n DXAMAIN

and in Windows:

set DXAMAIN=