The KWave package contains a KF5 based Sound Editor application.
This package is known to build and work properly using an LFS 11.3 platform.
Download (HTTP): https://download.kde.org/stable/release-service/22.12.2/src/kwave-22.12.2.tar.xz
Download MD5 sum: 41e49171074c1e3497185ab97c2f233c
Download size: 6.6 MB
Estimated disk space required: 72 MB
Estimated build time: 0.8 SBU (using parallelism=4)
AudioFile-0.3.6, fftw-3.3.10, id3lib-3.8.3, and KDE Frameworks-5.103.0
alsa-lib-1.2.8, FLAC-1.4.2, libogg-1.3.5, and PulseAudio-16.1
User Notes: https://wiki.linuxfromscratch.org/blfs/wiki/kwave
Install KWave by running the following commands:
mkdir build &&
cd    build &&
cmake -DCMAKE_INSTALL_PREFIX=$KF5_PREFIX \
      -DCMAKE_BUILD_TYPE=Release         \
      -DBUILD_TESTING=OFF                \
      -Wno-dev .. &&
make
        This package does not come with a test suite.
          Now, as the root user:
        
make install