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This isn't actually broken today (and therefore not requesting 1.5.1 backport).
libsasl doesn't come with pkg-config compatible manifests, so the PKG_CHECK_MODULES() isn't ever going to succeed.
If some distro however happens to provide their own, then cool. It still will work (before this patch) as that will be system install, not custom directory.
So, this patch is only fixing a very hypothetical future case where someone makes up their own .pc file with libsasl installed in random location – or – if the next release (if there ever will be any) includes a .pc file, and people start installing it out-of-systemdir.
That is also the reason why there are two AC_CHECK_HEADER() checks, one for pkg-config installed, and one for everything else.
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