diff --git a/CMakeLists.txt b/CMakeLists.txt
index 925e662..b01d226 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,15 @@ project(kde-ollie VERSION 0.1.0 LANGUAGES CXX)
 
 option(OLLIE_KF5 "Build against KF5/Qt5 (Plasma 5.27)" OFF)
 
+# Auto-detect: if OLLIE_KF5 not explicitly set, try KF6 first, fall back to KF5
+if(NOT DEFINED OLLIE_KF5 OR NOT OLLIE_KF5)
+    find_package(KF6 QUIET COMPONENTS Runner CoreAddons)
+    if(NOT KF6_FOUND)
+        message(STATUS "KF6 not found, falling back to KF5")
+        set(OLLIE_KF5 ON)
+    endif()
+endif()
+
 # Suppress CMP0160 warnings from KF5 cmake files (read-only IMPORTED property)
 if(OLLIE_KF5)
     cmake_policy(SET CMP0160 OLD)