FYI: elk developers have been informed about the upcoming libxc bugfix release, and elk is tracked hereĀ https://bugzilla.redhat.com/show_bug.cgi?id=1831479
GPAW is tracked hereĀ https://bugzilla.redhat.com/show_bug.cgi?id=1830675
I've orphaned exciting, since there was not much collaboration from the developers.

On Fri, May 15, 2020 at 11:44 AM Susi Lehtola <jussilehtola@fedoraproject.org> wrote:
On Fri, 15 May 2020 12:15:05 +0300
Susi Lehtola <jussilehtola@fedoraproject.org> wrote:
> Hello,
>
>
> unfortunately there's going to be *another* soname bump to libxc.
> Libxc 5 replaced the ancient "Fortran '90" interface with the Fortran
> 2003 version based on iso_c_binding. However, this included
> *renaming* the Fortran 2003 module and functions, which is obviously
> inconvenient for downstream projects and has caused a lot of hassle.
>
> This change is reverted in the upcoming libxc release, resulting in
> another soname bump, but a more backwards compatible API... It appears
> that the Fortran codes elk and exciting have not yet been compiled
> against libxc 5; the next release will be easier to compile against.

Nevermind, there's not going to be a soname bump; a copy of the
erroneously renamed library will also be shipped in the next release...
the main point being that libxcf03 will be there as well and stay there.
--
Susi Lehtola
Fedora Project Contributor
jussilehtola@fedoraproject.org