I've downloaded the source code for perl 5.14.0 to a 64-bit Sun Solaris machine and have run Configure –Dusethreads followed by make. I keep getting a compile-time error on the threads.xs file at line 1330, which is about where the definition of void ithread_yield(...) begins. Seems that the token called YIELD is not previously defined and minnie perl doesn't know what to make of it. Is this a recognized problem for which there is a fix? If I don't specify a threading version of perl I get a clean compile, but I'd really like to have threading. Much thanks in advance.