the latest version of spin is alwaysavailable via:	http://cm.bell-labs.com/cm/cs/what/spin/ to make the sources compile with the mkfile on plan 9the following changes were made: 	omitted memory.h from spin.h	omitted malloc.h from ps_msc.c	changed /lib/cpp to /bin/cpp in main.c	simplified non_fatal() in main.c to remove	use of yychar