diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.0)
 
 set(KF5_VERSION "5.49.0") # handled by release scripts
-set(KF5_DEP_VERSION "5.49.0") # handled by release scripts
+set(KF5_DEP_VERSION "5.39.0") # handled by release scripts
 
 project(kirigami2 VERSION ${KF5_VERSION})
 
@@ -52,7 +52,7 @@
 
 ################# set KDE specific information #################
 
-find_package(ECM 5.49.0 NO_MODULE)
+find_package(ECM 5.39.0 NO_MODULE)
 set_package_properties(ECM PROPERTIES TYPE REQUIRED DESCRIPTION "Extra CMake Modules." URL "https://projects.kde.org/projects/kdesupport/extra-cmake-modules")
 
 # where to look first for cmake modules, before ${CMAKE_ROOT}/Modules/ is checked
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -6,6 +6,7 @@
     set(KIRIGAMI_STATIC_FILES
         libkirigami/basictheme.cpp
         libkirigami/platformtheme.cpp
+        libkirigami/tabletmodewatcher.cpp
         libkirigami/kirigamipluginfactory.cpp)
 endif()