Kitware/CMake/Tests/VSWindowsFormsResx/CMakeLists.txt: Line 34. Purpose?

Setting up a cmake build for a windows forms application for the first time.

Kitware/CMake/Tests/VSWindowsFormsResx/CMakeLists.txt line 34: set(TARGET_LIBRARIES ${SYSLIBS}).

Can someone please explain what this does?

Much appreciated.