Quoting autoconf.info:
| `${VAR:-VALUE}'
| Old BSD shells, including the Ultrix `sh', don't accept the colon
| for any shell substitution, and complain and die.
Can I assume that any shell on a system, which has shared libraries,
understands `${foo:+bar}' and `${foo:-bar}' correctly, even if bar
happens to be `:'?
Rationale: it makes avoiding a stray colon in colon-separated variables
sooo much easier, and I don't think Libtool makes use of them for
systems without shared libraries.
Cheers,
Ralf
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