diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4dc23c5..db52ea5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,30 +1,32 @@
 project(breeze-gtk)
 set(PROJECT_VERSION "5.9.1")
 set(PROJECT_VERSION_MAJOR 5)
 
 cmake_minimum_required(VERSION 2.8.12)
 
 find_package(ECM 0.0.9 REQUIRED NO_MODULE)
 include(FeatureSummary)
 
-set(WITH_GTK3_VERSION 3.18 CACHE STRING
-    "Use the theme for the specified GTK+3 version (default: 3.18)")
-
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} "${CMAKE_SOURCE_DIR}/cmake")
+find_package(GTKEngine)
+
+find_package(PkgConfig)
+pkg_check_modules(PKG_GTK REQUIRED gtk+-3.0)
+
+set(WITH_GTK3_VERSION ${PKG_GTK_VERSION})
+
 include(KDEInstallDirs)
 
 # Exclude these patterns when installing directories as they have no use
 # in production.
 set(directory_EXCLUDES
     PATTERN "render-assets.sh" EXCLUDE
     PATTERN "assets.svg" EXCLUDE
     PATTERN "assets.txt" EXCLUDE
 )
 
 add_subdirectory(Breeze-dark-gtk)
 add_subdirectory(Breeze-gtk)
 add_subdirectory(kconf_update)
 
-find_package(GTKEngine)
-
 feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)