The project homepage is at https://fedorahosted.org/elfutils/

The current elfutils source code can be checked out with
git clone git://git.fedorahosted.org/git/elfutils.git

The developer mailinglist to send patches to is
elfutils-devel@lists.fedorahosted.org.
https://fedorahosted.org/mailman/listinfo/elfutils-devel

Please supply patches using git format-patch or using git send-email.

Sign your work

To facilitate tracking of who did what, we've adopted a "sign-off"
procedure for patches based on the procedure used by the Linux kernel
project.

The sign-off is a simple line at the end of the explanation for the
patch, which certifies that you wrote it or otherwise have the right
to pass it on as a patch under an appropriate license. The rules are
pretty simple: if you can certify the below:

        Developer's Certificate of Origin

        By making a contribution to this project, I certify that:

	(a) The contribution was created in whole or in part by me,
	    and I have the right to submit the contribution under each
	    license indicated in, or otherwise designated as being
	    applicable to, the file.

        (b) The contribution was provided directly to me by some other
            person who certified (a), and I have not modified it.

        (c) I understand and agree that the project and the
            contribution are public and that a record of the
            contribution (including all personal information I submit
            with it, including my sign-off) is maintained indefinitely
            and may be redistributed.

then you just add a line saying

Signed-off-by: Random J Developer <random@developer.example.org>

using your real name (sorry, no pseudonyms or anonymous contributions.)

git commit --signoff will add such a Signed-off-by line at the end of
the commit log message for you.