On VAX VMS 7.1 the linker has changed so that fqdriver and friends may
not link right as they used to.

This can be gotten around by using a command like


$ link/system=0/header fqdriver+sys$system:sys.stb/sel

instead of

$ link fqdriver+sys$system:sys.stb/sel+sys$input/opt
base=0
$!

and seems to work.