||Enable threading support through pthread (or other libraries on AIX, IRIX, HPUX, Solars). Highly recommended
||Controls whether to build the Abyss web-server with pthreads or fork 'threading'.
||Add elisp threading support
||Enable threading support. (DON'T DISABLE THIS UNLESS YOU KNOW WHAT YOU'RE DOING)
||Use separate thread to init connection (unsafe)
||Enable support for green threads
||Build the libraries with thread safe support
||Build multi-thread-compatible libraries instead of single-threaded only.