KDESu
User interface for running shell commands with root privileges.
KDESU provides functionality for building GUI front ends for (password asking) console mode programs. For example, kdesu and kdessh use it to interface with su and ssh respectively.
Using the Module
Using a KDE module's C++ API requires linking against the module library. The preferred way of consuming the library is through CMake.
Building with CMake
Use the find_package() command to locate the needed module component in the KF6 package:
find_package(KF6 REQUIRED COMPONENTS Su)
target_link_libraries(mytarget PRIVATE KF6::Su)
For more details, see the Build with CMake overview.