diff --git a/kcms/touchpad/src/backends/x11.cmake b/kcms/touchpad/src/backends/x11.cmake
--- a/kcms/touchpad/src/backends/x11.cmake
+++ b/kcms/touchpad/src/backends/x11.cmake
@@ -12,6 +12,7 @@
                     ${X11_X11_INCLUDE_PATH}
                     ${Synaptics_INCLUDE_DIRS}
                     ${XORG_INCLUDE_DIRS}
+                    ${XORGLIBINPUT_INCLUDE_DIRS}
 )
 
 SET(backend_SRCS