Created attachment 141895 [details] diffoscope output. I am packaging sonnet for the Guix GNU/Linux distribution. packages in Guix are all build in a clean isolated environment. Repeatedly building sonnet results in a differing libKF5SonnetCore.so.5.86.0. This also occurs for sonnet 5.70 STEPS TO REPRODUCE 1. guix build sonnet --no-grafts 2. guix build sonnet --no-grafts --check --keep-failed OBSERVED RESULT See attached diffoscope output. There is quite a large part of the binary that differs. I'm not really sure how it occurs. Please ask if you need any more info. EXPECTED RESULT The builds should be identical. See https://reproducible-builds.org/ SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Guix (available in About System) KDE Plasma Version: 21.08.1 KDE Frameworks Version: 5.86.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION Just ask if you need any more information.