Post by Akash Rawal
I observed that build-aux/bootstrap uses $(command) for command
substitution which is known to be less portable than `command`.
It's less portable only if you still intend to develop on any system
with /bin/sh as a non-POSIX sh (which is pretty much Solaris). There
aren't many GNU developers that use Solaris as their primary system. So
we haven't had many complaints.
At one point, Gary Vaughan contributed patches to rewrite the bootstrap
script using Autoconf's m4sh language, which uses portable shell
everywhere. But while projects like libtool and M4 have used his
rewrite, no one really ever took the time to review it for inclusion in
Eric Blake, Principal Software Engineer
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