diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b866c91..837f94f7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,228 +1,241 @@
 ## Setup
 cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
 
 project(QtCurve)
 
 include(FeatureSummary)
 
 ## Temporary
 function(translate_add_sources)
 endfunction()
 
 set(CMAKE_MODULE_PATH "${CMAKE_MODULE_PATH}"
   "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
 include(CMakeCMacros)
 
 ## Version
 set(QTCURVE_VERSION_MAJOR "1")
 set(QTCURVE_VERSION_MINOR "8")
 set(QTCURVE_VERSION_PATCH "18")
 set(QTCURVE_VERSION "${QTCURVE_VERSION_MAJOR}.${QTCURVE_VERSION_MINOR}")
 set(QTCURVE_VERSION_FULL "${QTCURVE_VERSION}.${QTCURVE_VERSION_PATCH}")
 
 find_package(Git QUIET)
 add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/version.cpp"
   DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/tools/gen-version.sh"
   WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
 add_custom_target(gen-git-ver ALL
   COMMAND "${CMAKE_CURRENT_SOURCE_DIR}/tools/gen-version.sh"
   "${CMAKE_CURRENT_BINARY_DIR}/version.cpp" "${QTCURVE_VERSION_FULL}"
   "${GIT_EXECUTABLE}"
   DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/version.cpp")
 
 ## Options
 function(qtc_option name doc def_val)
   if(DEFINED "${name}")
     set("${name}_DEFINED" On PARENT_SCOPE)
   else()
     set("${name}_DEFINED" Off PARENT_SCOPE)
     set("${name}" "${def_val}" PARENT_SCOPE)
   endif()
 endfunction()
 qtc_option(ENABLE_QT4 "Building Qt4 theme." On)
 qtc_option(ENABLE_QT5 "Building Qt5 theme." On)
 qtc_option(ENABLE_GTK2 "Building Gtk2 theme." On)
 # option(ENABLE_GTK3 "Building Gtk3 theme." On)
 option(ENABLE_TEST "Enable testing." On)
 option(QTC_ENABLE_X11 "Enable X11" On)
 option(QTC_INSTALL_PO "Install translation files." On)
 
-qtc_option(QTC_QT4_ENABLE_KDE "Building Qt4 style with KDE4 support." On)
-qtc_option(QTC_QT5_ENABLE_KDE
-  "Building Qt5 style with KDE Frameworks 5 support." On)
+if(ENABLE_QT4)
+    qtc_option(QTC_QT4_ENABLE_KDE "Building Qt4 style with KDE4 support." On)
+else()
+    qtc_option(QTC_QT4_ENABLE_KDE "Building Qt4 style with KDE4 support." Off)
+endif()
+if(ENABLE_QT5)
+    qtc_option(QTC_QT5_ENABLE_KDE
+      "Building Qt5 style with KDE Frameworks 5 support." On)
+else()
+    qtc_option(QTC_QT5_ENABLE_KDE
+      "Building Qt5 style with KDE Frameworks 5 support." On)
+endif()
 
 option(QTC_QT4_STYLE_SUPPORT
   "Qt4 support for creating a style for each QtCurve theme." Off)
 
 ## Common settings.
 # support an infix argument to have different qtcurve-utils libraries, e.g. for
 # GTk2, Qt4 and Qt5
 qtc_option(QTC_UTILSLIB_INFIX "Infix for having multiple qtcurve-utils's" "")
 qtc_option(QTC_KDE4_DEFAULT_HOME
   "Path of kde4 home (relative to user home), for reading old theme files only"
   ".kde4")
 
 if((QTC_KDE4_DEFAULT_HOME STREQUAL ".kde4") OR
     (QTC_KDE4_DEFAULT_HOME STREQUAL ".kde") OR
     (QTC_KDE4_DEFAULT_HOME STREQUAL ".kde4/") OR
     (QTC_KDE4_DEFAULT_HOME STREQUAL ".kde/") OR
     (QTC_KDE4_DEFAULT_HOME STREQUAL ""))
   set(QTC_KDE4_DEFAULT_HOME_DEFAULT True)
 else()
   set(QTC_KDE4_DEFAULT_HOME_DEFAULT False)
 endif()
 
-find_package(KDE4 QUIET)
-set(KDE4_KDECONFIG_EXECUTABLE)
-find_program(KDE4_KDECONFIG_EXECUTABLE NAMES kde4-config
-  PATHS "${CMAKE_INSTALL_PREFIX}/bin" ${_KDEDIRS} /opt/kde4/bin
-  NO_DEFAULT_PATH)
-if(NOT KDE4_KDECONFIG_EXECUTABLE)
-  find_program(KDE4_KDECONFIG_EXECUTABLE NAMES kde4-config)
+# set compiler flags earlier to prevent potential failure running find_package(KDE4)
+# glibc 2.20 warns about _BSD_SOURCE if _DEFAULT_SOURCE is not defined.
+cmake_c_add_flags(CMAKE_C_FLAGS -Wall -Wextra -Wno-cast-align
+  -std=gnu99 -D_DEFAULT_SOURCE)
+# Register storage class is deprecated in C++11 but is still used in Qt.
+# Use compiler option (-Wno-deprecated-register) to suppress
+# the warning in clang++.
+# We use `override` in certain Qt Classes but the QObject macro does not use it
+# Use compiler option (-Wno-inconsistent-missing-override) to suppress
+# the warning in clang++ 3.6+.
+cmake_c_add_flags(CMAKE_CXX_FLAGS -Wall -Wextra
+  -Wno-deprecated-register -Wno-cast-align
+  -Wno-inconsistent-missing-override)
+if(NOT APPLE)
+  # -std=c++0x is deprecated but gcc < 4.7 do not recognise c++11 ....
+  cmake_c_add_flags(CMAKE_CXX_FLAGS -std=c++0x -D_DEFAULT_SOURCE)
+  cmake_c_add_flags(CMAKE_SHARED_LINKER_FLAGS -Wl,--as-needed -Wl,--no-undefined)
+  cmake_c_add_flags(CMAKE_MODULE_LINKER_FLAGS -Wl,--as-needed -Wl,--no-undefined)
+else()
+  cmake_c_add_flags(CMAKE_CXX_FLAGS -std=c++11)
+endif()
+
+if(QTC_QT4_ENABLE_KDE)
+    find_package(KDE4 QUIET)
+    set(KDE4_KDECONFIG_EXECUTABLE)
+    find_program(KDE4_KDECONFIG_EXECUTABLE NAMES kde4-config
+      PATHS "${CMAKE_INSTALL_PREFIX}/bin" ${_KDEDIRS} /opt/kde4/bin
+      NO_DEFAULT_PATH)
+    if(NOT KDE4_KDECONFIG_EXECUTABLE)
+      find_program(KDE4_KDECONFIG_EXECUTABLE NAMES kde4-config)
+    endif()
 endif()
 
 function(get_cmd_var varname def cmd)
   if(DEFINED ${varname})
     return()
   endif()
   if(cmd)
     execute_process(COMMAND "${cmd}" ${ARGN} OUTPUT_VARIABLE _cmd_out
       RESULT_VARIABLE _cmd_res)
     if("${_cmd_res}" EQUAL 0)
       string(STRIP "${_cmd_out}" _cmd_out)
     else()
       set(_cmd_out "${def}")
     endif()
   else()
     set(_cmd_out "${def}")
   endif()
   set("${varname}" "${_cmd_out}" PARENT_SCOPE)
 endfunction()
 
 function(get_kde_var var def)
   get_cmd_var(_output "${def}" "${KDE4_KDECONFIG_EXECUTABLE}" ${ARGN})
   set(${var} "${_output}" PARENT_SCOPE)
 endfunction()
 
 get_kde_var(QTC_KDE4_PREFIX "${CMAKE_INSTALL_PREFIX}" --prefix)
 get_kde_var(QTC_KDE4_ICONS_PREFIX "${QTC_KDE4_PREFIX}/share/icons"
   --install icon)
 
 ## Handle options
 find_package(Libexecinfo)
 if(LIBEXECINFO_LIB_FOUND)
   set(QTC_ENABLE_BACKTRACE On)
 else()
   set(QTC_ENABLE_BACKTRACE Off)
 endif()
 
 if(QTC_ENABLE_X11)
   macro(qtc_check_x11)
     find_package(PkgConfig)
     if(NOT PKG_CONFIG_FOUND)
       message(WARNING "Cannot find pkg-config, disable x11 support.")
       set(QTC_ENABLE_X11 Off)
       set(QTC_X11_FOUND Off)
       return()
     endif()
     unset(__pkg_config_checked_QTC_X11 CACHE)
     # pkg_check_modules(QTC_X11 xcb x11-xcb xrender)
     if(QTC_ENABLE_X11)
       pkg_check_modules(QTC_X11 xcb x11-xcb)
     else()
       pkg_check_modules(QTC_X11 xcb)
     endif()
     if(NOT QTC_X11_FOUND AND QTC_ENABLE_X11)
       message(WARNING
         "Cannot find required modules for x11, disable x11 support.")
       set(QTC_ENABLE_X11 Off)
       return()
     endif()
   endmacro()
   qtc_check_x11()
 else()
   set(QTC_X11_FOUND Off)
 endif()
 
 if(QTC_X11_FOUND)
   include_directories(${QTC_X11_INCLUDE_DIRS})
   add_definitions(${QTC_X11_CFLAGS})
 else()
   include_directories(SYSTEM "${CMAKE_CURRENT_SOURCE_DIR}/lib/xcb-defs")
 endif()
 
 if(ENABLE_GTK2 AND NOT ENABLE_GTK2_DEFINED)
   find_package(PkgConfig)
   if(NOT PKG_CONFIG_FOUND)
     message(WARNING "pkg-config not found, disable Gtk2 build.")
     set(ENABLE_GTK2 Off)
   else()
     unset(__pkg_config_checked_GTK2 CACHE)
     pkg_check_modules(GTK2 gtk+-2.0)
     if(NOT GTK2_FOUND)
       message(WARNING "gtk+-2.0 not found, disable Gtk2 build.")
       set(ENABLE_GTK2 Off)
     endif()
   endif()
 endif()
 
 if(ENABLE_GTK2)
   find_package(PkgConfig REQUIRED)
   unset(__pkg_config_checked_GTK2 CACHE)
   pkg_check_modules(GTK2 REQUIRED gtk+-2.0)
   if(GTK2_THEME_PREFIX)
     set(GTK2_PREFIX "${GTK2_THEME_PREFIX}")
   elseif(NOT GTK2_PREFIX)
     set(GTK2_PREFIX "${CMAKE_INSTALL_PREFIX}")
   endif()
   if(NOT GTK2_LIBDIR)
     set(GTK2_LIBDIR "${GTK2_PREFIX}/lib")
   endif()
   _pkgconfig_invoke(gtk+-2.0 GTK2 BIN_VERSION "" --variable=gtk_binary_version)
   set(GTK2_THEME_DIR ${GTK2_PREFIX}/share/themes/QtCurve)
 endif()
 
 configure_file(config.h.in config.h @ONLY)
 
 include_directories("${CMAKE_CURRENT_BINARY_DIR}")
 cmake_c_fix_include_path(lib/utils qtcurve-utils)
 cmake_c_fix_include_path(lib/cairo qtcurve-cairo)
-# glibc 2.20 warns about _BSD_SOURCE if _DEFAULT_SOURCE is not defined.
-cmake_c_add_flags(CMAKE_C_FLAGS -Wall -Wextra -Wno-cast-align
-  -std=gnu99 -D_DEFAULT_SOURCE)
-# Register storage class is deprecated in C++11 but is still used in Qt.
-# Use compiler option (-Wno-deprecated-register) to suppress
-# the warning in clang++.
-# We use `override` in certain Qt Classes but the QObject macro does not use it
-# Use compiler option (-Wno-inconsistent-missing-override) to suppress
-# the warning in clang++ 3.6+.
-cmake_c_add_flags(CMAKE_CXX_FLAGS -Wall -Wextra
-  -Wno-deprecated-register -Wno-cast-align
-  -Wno-inconsistent-missing-override)
-if(NOT APPLE)
-  # -std=c++0x is deprecated but gcc < 4.7 do not recognise c++11 ....
-  cmake_c_add_flags(CMAKE_CXX_FLAGS -std=c++0x -D_DEFAULT_SOURCE)
-  cmake_c_add_flags(CMAKE_SHARED_LINKER_FLAGS -Wl,--as-needed -Wl,--no-undefined)
-  cmake_c_add_flags(CMAKE_MODULE_LINKER_FLAGS -Wl,--as-needed -Wl,--no-undefined)
-else()
-  cmake_c_add_flags(CMAKE_CXX_FLAGS -std=c++11)
-endif()
 add_definitions("-D_GNU_SOURCE -pthread")
 
 if(NOT DEFINED LIB_INSTALL_DIR)
   set(LIB_INSTALL_DIR lib)
 endif()
 
 cmake_c_include_fix_path()
 add_subdirectory(lib)
 add_subdirectory(qt4)
 add_subdirectory(qt5)
 add_subdirectory(gtk2)
 add_subdirectory(tools)
 if(ENABLE_TEST)
   enable_testing()
   add_subdirectory(test)
 endif()
 
 feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)