Надо просто %K6build -DQT_VERSION_MAJOR=6
heaptrack-1.5.0-alt3 -> sisyphus: Thu Sep 17 2026 Mikhail Tergoev <fidel@altlinux> 1.5.0-alt3 - build GUI with Qt6/KF6 instead of Qt5/KF5 (ALT bug 59545) - cherry-picked upstream fixes for KF6 (KChart6, KConfigGroup, QPalette)