mark obsolete usage of fold

Glenn L. McGrath bug1 at
Sat Dec 10 22:53:28 UTC 2005

Attached is a patch sets a feature to allow 'fold -40' type arguments
to fail, this behaviour is obsolete even in susv2.

Im sure some scripts (e.g. configure) are still using it, so its
usefull to support it.

The patch doesnt change default behaviour. Its really just to start to
organise things so we can one day have a global setting to choose what
posix standard to compile to.

Its been a long time since i committed anything, i expect to be more
active in the future...

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