DOC "Intel TBB directory with includes, libs and dlls (i.e. where you extracted the binary distribution from threadingbuildingblocks.org.)"
)
IF(NOT TBB_ROOT)
MESSAGE(FATAL_ERROR "Could not find Intel TBB. Please set TBB_ROOT to the Intel TBB directory with includes, libs and dlls (i.e. where you extracted the binary distribution from threadingbuildingblocks.org.)")