Public bug reported:

[impact]

the 'configure' file checks for the existence of a '.git' directory, and
if present it enables special build options that aren't used for
'normal' builds, some of which may cause the build to fail. This doesn't
affect builds in PPAs or in the archive, since those do not happen in a
git repo checkout, but this does cause very confusing failures and/or
alternate behavior when building locally from a 'git ubuntu' checkout of
the package.

[test case]

pull-lp-source qemu and build; assuming the build-deps are installed, it
will build correctly.

git ubuntu clone qemu and build; it will likely fail to build even if
build-deps are installed, and even if it does build, the result will be
different than a non-git build.

[regression potential]

any regression would likely cause a failed build, or incorrectly built
package.

[scope]

this 'feature' comes from upstream, so this is needed in all releases.

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1887535

Title:
  build operates differently if source is a git repo

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