Hi Paolo, * Paolo Bonzini wrote on Tue, Oct 14, 2008 at 07:16:48AM CEST: > This patch modernizes a bit what we assume about unset. In particular, > we assume that unset exists but might fail if the variable is not present. > We also assume that the user won't unset MAIL and MAILCHECK; we do that > in m4sh's initialization in a way that won't upset Bash 2.01 (did not > test it though, I don't have that shell). > > This in turn removes the need for _AS_UNSET_PREPARE.
Unfortunately, Libtool uses $as_unset, and I guess some other packages do, too. :-/ And I'm not *that* much of an old shell expert. But <http://www.in-ulm.de/~mascheck/bourne/> states that Version 7 sh didn't have unset at all. Darn, it also states that, while 'unset' was added in SVR2, ${var:-repl} was already in System III. Cheers, Ralf
