Looks like it was due to libtool's configure.ac setting AC_PREREQ to be 2.62, which is below the new gnulib's minimum version requirement (2.63).
The version requirement should not cause any trouble since Debian has been shipping autoconf 2.63+ for over 10 years. However, I'd like to keep this bug open until libtool upstream has raised the autoconf version requirement. Before that, I will patch gnulib and accept the 2.62 version string for now. Thanks, Boyuan Yang On Thu, 09 Jan 2020 11:12:54 -0500 Boyuan Yang <by...@debian.org> wrote: > Source: libtool > Severity: important > Version: 2.4.6-11 > > Dear libtool maintainer, > > During a rebuild test of all gnulib reverse build-dependencies, your package > (libtool) will FTBFS with the new snapshot of gnulib ( > https://tracker.debian.org/pkg/gnulib , currently in experimental). The build > log is provided in the attachment. > > The build log suggests that the error lies in a version check for autoconf. I > haven't dug into it but the fix should be trivial once the FTBFS cause is > found.
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