diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69c8b61..86b88ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,118 +1,123 @@
 
 cmake_minimum_required(VERSION 3.0)
 
 set(KF5_VERSION "5.48.0") # handled by release scripts
 set(KF5_DEP_VERSION "5.48.0") # handled by release scripts
 project(KService VERSION ${KF5_VERSION})
 
+# Disallow in-source build
+if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+   message(FATAL_ERROR "KService requires an out of source build. Please create a separate build directory and run 'cmake path_to_kservice [options]' there.")
+endif()
+
 # ECM setup
 include(FeatureSummary)
 find_package(ECM 5.48.0  NO_MODULE)
 set_package_properties(ECM PROPERTIES TYPE REQUIRED DESCRIPTION "Extra CMake Modules." URL "https://projects.kde.org/projects/kdesupport/extra-cmake-modules")
 feature_summary(WHAT REQUIRED_PACKAGES_NOT_FOUND FATAL_ON_MISSING_REQUIRED_PACKAGES)
 
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/cmake )
 
 include(KDEInstallDirs)
 include(KDEFrameworkCompilerSettings NO_POLICY_SCOPE)
 include(KDECMakeSettings)
 include(ECMSetupVersion)
 include(ECMGenerateHeaders)
 include(ECMAddQch)
 include(ECMQtDeclareLoggingCategory)
 include(GenerateExportHeader)
 
 option(BUILD_QCH "Build API documentation in QCH format (for e.g. Qt Assistant, Qt Creator & KDevelop)" OFF)
 add_feature_info(QCH ${BUILD_QCH} "API documentation in QCH format (for e.g. Qt Assistant, Qt Creator & KDevelop)")
 
 ecm_setup_version(PROJECT
                   VARIABLE_PREFIX KSERVICE
                   VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/kservice_version.h"
                   PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5ServiceConfigVersion.cmake"
                   SOVERSION 5)
 
 set(APPLICATIONS_MENU_NAME applications.menu
     CACHE STRING "Name to install the applications.menu file as.")
 
 # Dependencies
 set(REQUIRED_QT_VERSION 5.8.0)
 find_package(Qt5 ${REQUIRED_QT_VERSION} CONFIG REQUIRED DBus Xml)
 
 find_package(KF5Config ${KF5_DEP_VERSION} REQUIRED)
 find_package(KF5CoreAddons ${KF5_DEP_VERSION} REQUIRED)
 find_package(KF5Crash ${KF5_DEP_VERSION} REQUIRED)
 find_package(KF5DBusAddons ${KF5_DEP_VERSION} REQUIRED)
 find_package(KF5I18n ${KF5_DEP_VERSION} REQUIRED)
 find_package(KF5DocTools ${KF5_DEP_VERSION})
 
 find_package(FLEX REQUIRED)
 set_package_properties(FLEX PROPERTIES
     URL "http://flex.sourceforge.net"
     DESCRIPTION "Fast Lexical Analyzer"
     TYPE REQUIRED
     PURPOSE "Required for the Trader parser"
 )
 
 find_package(BISON REQUIRED)
 set_package_properties(BISON PROPERTIES
     URL "http://www.gnu.org/software/bison"
     DESCRIPTION "general-purpose parser generator"
     TYPE REQUIRED
     PURPOSE "Required for the Trader parser"
 )
 
 add_definitions(-DTRANSLATION_DOMAIN=\"kservice5\")
 if (IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/po")
     ki18n_install(po)
 
     if (KF5DocTools_FOUND)
         kdoctools_install(po)
     endif()
 endif()
 
 if (KF5DocTools_FOUND)
     add_subdirectory(docs)
 endif()
 
 add_subdirectory(src)
 if (BUILD_TESTING)
     add_subdirectory(autotests)
     add_subdirectory(tests)
 endif()
 
 # create a Config.cmake and a ConfigVersion.cmake file and install them
 set(CMAKECONFIG_INSTALL_DIR "${KDE_INSTALL_CMAKEPACKAGEDIR}/KF5Service")
 
 if (BUILD_QCH)
     ecm_install_qch_export(
         TARGETS KF5Service_QCH
         FILE KF5ServiceQchTargets.cmake
         DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
         COMPONENT Devel
     )
     set(PACKAGE_INCLUDE_QCHTARGETS "include(\"\${CMAKE_CURRENT_LIST_DIR}/KF5ServiceQchTargets.cmake\")")
 endif()
 
 include(CMakePackageConfigHelpers)
 
 configure_package_config_file("${CMAKE_CURRENT_SOURCE_DIR}/KF5ServiceConfig.cmake.in"
                               "${CMAKE_CURRENT_BINARY_DIR}/KF5ServiceConfig.cmake"
                               INSTALL_DESTINATION  ${CMAKECONFIG_INSTALL_DIR}
                              )
 
 install(EXPORT KF5ServiceTargets DESTINATION "${CMAKECONFIG_INSTALL_DIR}" FILE KF5ServiceTargets.cmake NAMESPACE KF5:: )
 
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/KF5ServiceConfig.cmake"
               "${CMAKE_CURRENT_BINARY_DIR}/KF5ServiceConfigVersion.cmake"
               "${CMAKE_CURRENT_SOURCE_DIR}/KF5ServiceMacros.cmake"
         DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
         COMPONENT Devel
        )
 
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/kservice_version.h
         DESTINATION ${KDE_INSTALL_INCLUDEDIR_KF5} COMPONENT Devel )
 
 # contains list of debug categories, for kdebugsettings
 install(FILES kservice.categories DESTINATION ${KDE_INSTALL_CONFDIR})
 
 feature_summary(WHAT ALL   FATAL_ON_MISSING_REQUIRED_PACKAGES)