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I'm attempting to backport Clang 3.2 to Quantal from Raring. Thinking this would be a relatively painless process, I ran the following command:

backportpackage -s raring -d quantal -u ppa:george-edison55/clang3.2-backports clang

The package was uploaded to the PPA without any errors and built without any errors as well. Unfortunately, it cannot be installed because the debian/control file contains the following dependencies:

Depends: ... libgcc-4.7-dev, libobjc-4.7-dev ...

Those packages do not exist in Quantal. The contents of those packages is contained in the gcc-4.7 Install gcc-4.7 and gobjc-4.7 Install gobjc-4.7 packages instead. My problem is that I have no idea how to make the change before uploading the package to my PPA.

I tried instructing backportpackage not to upload to my PPA and dump the files in /tmp/clang3.2 where I edited them. However, attempting to upload the package simply results in the original .tar.gz being downloaded again and overwriting my changes.

What is the proper way of doing this?

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Even though there's -w option that tells backportpackage to preserve the working directory, there's still no way to tell it keep the unpacked (and modified) sources as well. So here's what worked for me:

  1. Copy the program locally to modify it:

    cp /usr/bin/backportpackage ~

  2. Open the local file and find do_backport function. Its last line should look like

    shutil.rmtree(srcdir)

  3. Delete that line, save the file, and run the script as you normally do it, make sure to provide -w option to specify the working directory.

  4. Go to the working directory. There should be sub-directory with the name like <package>-<dist>, e.g. gcc-xenial.
  5. cd to that directory, do whatever changes you want to do.
  6. Make a debian package. Sign and upload the result:

    debuild --no-lintian -S -nc -uc -us -sd

    debsign ../<package-version>_source.changes

    dput -u ppa:<user>/<repo> <package-version>_source.changes

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