Configure clacc from CCS (OpenMP Accelerator, AM57xx)

I'm making CodeComposerStudio (6.1.3)  projects for OpenMP Accelerator Model. I'm currently planning to use my makefiles that contain all the Flags required for the OAM compile. One thing I'm stumbling is the fact that clacc requires the TARGET_ROOTDIR environment variable.

It would be nice to set that from CCS as the compiler (GCC 5.3.1 Linaro from TI Processor SDK Linux Version 3.0.0.4 or 3.1.0.6) toolchain is set up and usable in the CCS (there are other normal ARM Projects using it without problems). However, I can't find a preset value that would point to the arm side sysroot ,e.g. for 3.1.0.6:

~/ti-processor-sdk-linux-am57xx-evm-03.01.00.06/linux-devkit/sysroots/armv7ahf-neon-linux-gnueabi

If someone would use the 3.0.0.4 SDK with the project, the last component of the path (except for the version number) would have to be cortexa15hf-neon-linux-gnueabi. I would like to setup the CCS project so that this value would automatically be set correctly into TARGET_ROOTDIR. Obviously a workaround would be to let all users set this path in their own environment outside of CCS to their matching location, but that I'd like to avoid.

Is there any way to achieve this? Or is there a way to let CCS build a makefile automatically that contains this settings for OAM/clacc?