[Beowulf] Stupid MPI programming question

[Mark Hahn]

> 	#include <errno.h>
> 	extern int errno;

IMO, it's bad practice to put externs in your code when a header already
declares them...  and indeed, the header _should_ contain externs for any
exported symbols...

also, "man 3 strerror" ;)

regards, mark hahn.
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