The configure file now accepts an option --with-tbb=no. Use it to avoid a dependency on tbb, though then times in logs will be less accurate and there will be no support for multithreading. The Makefile created by build/setup/make-Makefile.sh now accepts an option mathicgb_conf, which is passed on to configure. So you can do make rel mathicgb_conf="--with-tbb=no" to set up a release mode build without tbb.