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This bug appears to have been reported against 'rawhide' during the Fedora 33 development cycle.
Changing version to 33.

EPEL branch uses the same spec file of master branch.
There, it has recently been introduced the new cmake macros [1]

%cmake OR %cmake_kf5
%cmake_build
%cmake_install

but they do not work on EL8 at the moment, so we need to add proper macros to skip them.
A good example how to handle this, is my spec file
https://src.fedoraproject.org/rpms/darktable/blob/master/f/darktable.spec

[1]: https://fedoraproject.org/wiki/Changes/CMake_to_do_out-of-source_builds

Dear Maintainer,

your package has an open Fails To Build From Source bug for Fedora 33.
Action is required from you.

If you can fix your package to build, perform a build in koji, and either create
an update in bodhi, or close this bug without creating an update, if updating is
not appropriate [1]. If you are working on a fix, set the status to ASSIGNED to
acknowledge this. If you have already fixed this issue, please close this Bugzilla report.

Following the policy for such packages [2], your package will be orphaned if
this bug remains in NEW state more than 8 weeks (not sooner than 2020-09-28).

A week before the mass branching of Fedora 34 according to the schedule [3],
any packages not successfully rebuilt at least on Fedora 32 will be
retired regardless of the status of this bug.

[1] https://fedoraproject.org/wiki/Updates_Policy
[2] https://docs.fedoraproject.org/en-US/fesco/Fails_to_build_from_source_Fails_to_install/
[3] https://fedorapeople.org/groups/schedule/f-34/f-34-key-tasks.html

Help needed

I created an updated spec file with new [1] cmake flags
https://download.copr.fedorainfracloud.org/results/germano/erase_me/fedora-rawhide-x86_64/01927782-firefox-pkcs11-loader/firefox-pkcs11-loader.spec

but the build [2] fails:
===
CMake Error at x86_64-redhat-linux-gnu/cmake_install.cmake:41 (file):
  file INSTALL cannot find
  "/builddir/build/BUILD/firefox-pkcs11-loader-3.13.6/x86_64-redhat-linux-gnu/{02274e0c-d135-45f0-8a9c-32b35110e10d}.xpi":
  No such file or directory.
===
and it's weird because the package structure has not changed, it's the same that built sccessfully on older Fedora branches

Adding in CC mohanboddu that is trying to build the F34 package

[1]: https://fedoraproject.org/wiki/Changes/CMake_to_do_out-of-source_builds
[2]: https://copr.fedorainfracloud.org/coprs/germano/erase_me/build/1927782/

FEDORA-2021-9cb3a970c6 has been submitted as an update to Fedora 33. https://bodhi.fedoraproject.org/updates/FEDORA-2021-9cb3a970c6