When i tried building TBB on ia64 system, i was facing an issue with ias assembler. This assembler is not available in the system. So i changed the assembler to "as" instead of "ias" inside the file build/linux.gcc.inc.
Because the "as" assembler is available in my system and "ias" is not available. It is working now and i am able to compile and build the TBB code. Please let me know, if anything is wrong here.