# Build Overview

The build system exists in the CVS module build. Once the build module has been checked out, the environment variable BUILD_ROOT needs to be set to the path of the directory. Build system commands are in the build/bin subdirectory of the build module, and therefore it needs to be added to you PATH environment variable on UNIX and Windows. Macintosh usage is more complex.

Environment Variable | Description
--- | ---
BUILD_ROOT | Set to the path of the build module.
PATH | Make sure to include build/bin.
SYSTEM_ID | Set this to the system id of the target platform if the default isn't what you want.

Additional support programs may be required.