SUMMARY The bug was reported 3 months ago: https://forum.qt.io/topic/99507/project-error-library-libatomic-is-not-defined https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921930 It was fixed in Debian almost immediately as can be seen here ("Revert part of the mkspecs movements between packages"): https://metadata.ftp-master.debian.org/changelogs//main/q/qtbase-opensource-src/qtbase-opensource-src_5.11.3+dfsg1-1_changelog But I can still reproduce the bug in a fully updated KDE neon system. STEPS TO REPRODUCE Run qmake on some pro file without the qtbase5-private-dev package installed. OBSERVED RESULT qmake fails with the following error: "Project ERROR: Library 'libatomic' is not defined." EXPECTED RESULT qmake succeeds. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE neon 5.15 User Edition with latest updates inside a virtual machine KDE Plasma Version: 5.15.5 KDE Frameworks Version: 5.57.0 Qt Version: 5.12.0
The issue is no longer present in the current version of KDE neon.