LAME has just been added to Fedora 25 and newer (still in updates-testing with buildroot override in place). k3b should be able to benefit therefrom by adding BuildRequires: lame-devel and removing the -DK3B_BUILD_LAME_ENCODER_PLUGIN:BOOL=OFF cmake flag.
both libmad/lame support included in latest rawhide build: %changelog * Sun May 21 2017 Rex Dieter <rdieter> - 1:17.04.1-1 - 17.04.1 Will do for f26 soon too (and consider backporting changes for older f24/f25 releases sometime)
dragon-17.04.1-1.fc26 juk-17.04.1-1.fc26 k3b-17.04.1-1.fc26 kf5-audiocd-kio-17.04.1-1.fc26 kf5-libkcddb-17.04.1-1.fc26 kf5-libkcompactdisc-17.04.1-1.fc26 kmix-17.04.1-1.fc26 kscd-17.04.1-1.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-1fdc56e773
dragon-17.04.1-1.fc26, juk-17.04.1-1.fc26, k3b-17.04.1-1.fc26, kf5-audiocd-kio-17.04.1-1.fc26, kf5-libkcddb-17.04.1-1.fc26, kf5-libkcompactdisc-17.04.1-1.fc26, kmix-17.04.1-1.fc26, kscd-17.04.1-1.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-1fdc56e773
dragon-17.04.1-1.fc26, juk-17.04.1-1.fc26, k3b-17.04.1-1.fc26, kf5-audiocd-kio-17.04.1-1.fc26, kf5-libkcddb-17.04.1-1.fc26, kf5-libkcompactdisc-17.04.1-1.fc26, kmix-17.04.1-1.fc26, kscd-17.04.1-1.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.
*** Bug 181031 has been marked as a duplicate of this bug. ***
*** Bug 130062 has been marked as a duplicate of this bug. ***