The kf5-kcmutils-devel package contains libraries and header files for developing applications that use kf5-kcmutils.
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Development files for kf5-kconfigwidgets
The kf5-kconfigwidgets-devel package contains libraries and header files for developing applications that use kf5-kconfigwidgets.
The kf5-kservice-devel package contains libraries and header files for developing applications that use kf5-kservice.
KDE Frameworks 5 Tier 3 addon with extra API to write KConfigModules
KCMUtils provides various classes to work with KCModules. KCModules can be created with the KConfigWidgets framework.