Booting AM1808 on custom board

Hi,

 I am trying to compile the serial flasher utility on my ubuntu12.04 host. I have installed the linux sdk, c6x compiler and arago tool chain.

I am following the wiki in link below:

http://processors.wiki.ti.com/index.php/Serial_Boot_and_Flash_Loading_Utility_for_OMAP-L138

In referred wiki after setting the PATH in env there is a line which says following:

"Edit the build.mak file under Common directory and add the paths to ARM and C6x compilers."

Can you tell me which paths will I have to set in this file and any other steps which are not mentioned clearly in this wiki.

Thanks