$ LANG=C makepkg -s
==> Making package: ironpython-git 2.7.9.r17.g3071442ad-1 (Thu Jan 24 12:11:17 2019)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Updating ironpython-git git repo...
Fetching origin
  -> Found package.patch
==> Validating source files with sha256sums...
    ironpython-git ... Skipped
    package.patch ... Passed
==> Extracting sources...
  -> Creating working copy of ironpython-git git repo...
Switched to a new branch 'makepkg'
==> Starting prepare()...
patching file Package/deb/Deb.Packaging.targets
Hunk #2 FAILED at 23.
1 out of 2 hunks FAILED -- saving rejects to file Package/deb/Deb.Packaging.targets.rej
==> ERROR: A failure occurred in prepare().
    Aborting...