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+Once upon a time Upas ran on many versions of Unix.
+This is a partial rewrite to ANSI C specifically for Plan 9.
+It uses's Plan 9's bio library instead of stdio and Plan 9's
+regular expression library.
+
+I've tried to make portability possible but it has
+never been ported.  To port Upas to another system:
+
+	- port Plan 9's libbio library working on that system (already available).
+	- port Plan 9's regexp library working on that system (should just compile).
+	- rewrite common/libsys.c to reflect system calls for that system.  This
+	  file contains all the really system dependent code that differs between
+	  Plan 9 and each Unix.  This includes file management, signal
+	  handling, process control and error handling.
+	- change the important directory trees in common/mail.c to reflect
+	  where you want things like 
+	- get the ARGBEGIN/ARGEND/ARGF macros from Plan 9's libc.h
+	- get the include files correct in common/sys.h
+	- rewrite smtp/mxdial to use the conventions of that system
+	- rewrite runq.c to walk queues on that system.