[DRE-maint] Bug#1029632: unblock: ruby3.1/3.1.2-5

[Antonio Terceiro]

Package: release.debian.org
Severity: normal
User: release.debian.org at packages.debian.org
Usertags: unblock
X-Debbugs-Cc: ruby3.1 at packages.debian.org
Control: affects -1 + src:ruby3.1

Please unblock package ruby3.1

This is a trivial bug fix, and even though there is no real block hint
in place, this bug report is to save you the time from wondering about
the changes.

[ Reason ]
3.1.2-4 had a regression. ./configure was being about an explicit
pkg-config binary, but pkg-config was not a build dependency. So
the pkg-config binary was not really there, so ./configure set the
corresponding configuration variable to an empty string making the
pkg-config bindings in mkmf.rb not really work.

[ Impact ]
This makes some packages fail to build from source, namely ruby-augeas
and ruby-libvirt.

[ Tests ]
An autopkgtest to catch similar issues in the future has been added, and
it passes while it failed with 3.1.2.4.

[ Risks ]
None.

[ Checklist ]
  [✓] all changes are documented in the d/changelog
  [✓] I reviewed all changes and I approve them
  [✓] attach debdiff against the package in testing

[ Other info ]
n/a

unblock ruby3.1/3.1.2-5
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