test for nbsp option in listchars

In vim 7+ this works:

set listchars+=nbsp:=

but vim 6 does not have the option 'nbsp:c' and will give an error.

How to check? Only by version number?

if v:version >= 700 "vim6.2
set listchars+=nbsp:= " show non-breaking space
endif

Something like this does not seem to work:

echo exists("+nbsp")

Since I do not always know what version has an option, testing
v:version is not reliable.

Bill

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