configure: Remove bashisms, fix dash compatibility. #1538
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+= and |& are not supported by systems using dash as shell.
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Thank you @olifre! Sorry to miss this earlier. |
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Many thanks for the quick review and merge, @reidpr ! 😄 |
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+=and|&are not supported by systems using dash as shell, replace them by more clumsy but more portable syntax.See https://bugs.gentoo.org/890873 for an example report from a system using
dashas/bin/sh.