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OS4 DOS SetVar() patch 53.1 (c) C.Wenzel. Feb-2010
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This patch is a quick fix for dos.library V53.48 
from the OS4.1 update 1 release.

Some applications are dependant on the default
behaviour of IDOS->SetVar() and IDOS->DeleteVar().

This patch will only work with DOS Library 53.48 - 53.50
Running it with any other versions does nothing.

Place the executable somewhere convenient, such as the root
directory of your boot disk and start the patch from the 
user-startup file as;
    run  >nil:  sys:SetVar_Patch53

PATCHES:
    size=0    : which returned failure rather than success.
    control=0 : which had a different default function than before.

You can easily check to make sure it installed ok by typing the
following line in a shell;
    set  foobar  ""
It will fail with "Can't set foobar" before the patch is installed, 
but it will not fail afterwards.

The effects of this patch will be incorporated in a later
dos.library version.