[Sparforte] Bourne shell required.

[Pascal]

Hello,

configure script requires Bourne Shell and exits if not.

When tested with Alire checks (https://github.com/alire-project/alire-index/pull/656), they are failed for Debian, Fedora and Ubuntu.
I'm puzzled that the shell of these OS aren't compatible with Bourne Shell.

Isn't this configure requirement too much restrictive?

Thanks, Pascal.
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