To build, setup the pointers to the dependencies (probably use the products/ dir
of a TI-RTOS distribution):

    $ export XDCTOOLS_INSTALLATION_DIR=/path/to/xdctools_3_25_05_94
    $ TIRTOS_DEPS=/path/to/tirtos_1_21_00_09/products
    $ export BIOS_INSTALLATION_DIR=$TIRTOS_DEPS/bios_3_67_00_20
    $ export IPC_INSTALLATION_DIR=$TIRTOS_DEPS/ipc_3_10_01_11
    $ export UIA_INSTALLATION_DIR=$TIRTOS_DEPS/uia_1_04_00_06
    $ export NDK_INSTALLATION_DIR=$TIRTOS_DEPS/ndk_2_23_01_01
    $ export TIVAWARE_INSTALLATION_DIR=$TIRTOS_DEPS/TivaWare_C_Series-2.0.1.11577a
    $ export MWARE_INSTALLATION_DIR=''

Note that it is important to set the MWARE dir in order to override the default
and prevent the MWARE targets from being added to the build list.

    $ make -f tirtos.mak CCS_BUILD=false TIRTOS_INSTALLATION_DIR=$PWD \
        GCC_INSTALLATION_DIR=/usr drivers