diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -84,14 +84,6 @@
 find_package(Qt5OpenGL REQUIRED)
 find_package(Qt5PrintSupport REQUIRED)
 
-if(QTONLY)
-  # Forward the old QTONLY=TRUE option to the new WITH_KDE=FALSE
-  set(WITH_KF5 FALSE)
-  # And unset it quickly. Nobody shall use it anymore anywhere.
-  # to detect if KDE _should_ be used (set by user): WITH_KDE but do not use it within src/lib/
-  unset(QTONLY)
-endif()
-
 cmake_minimum_required(VERSION 2.8.12)
 set(MARBLEWIDGET marblewidget-qt5)