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authorKaz Kylheku <kaz@kylheku.com>2020-04-17 22:33:37 -0700
committerKaz Kylheku <kaz@kylheku.com>2020-04-17 22:33:37 -0700
commitd2bdf58f902a774a11ae2f065561a759a054904e (patch)
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configure: detect more good shells.
* configure: There is a clue in the PS2 and PS4 variables. If these are present and have the values "> " and "+ " the shell could be Dash or newer NetBSD Ash, which got PS4 circa 2004. The Solaris XPG shell also has these.
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