diff --git a/CMakeLists.txt b/CMakeLists.txt
index d9abcfb..4befdf6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,16 +14,6 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "Release")
 endif()
 
-include(GNUInstallDirs)
-set(CROSSGUID_INC_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR}")
-set(CROSSGUID_RUNTIME_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}")
-set(CROSSGUID_LIBRARY_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}")
-set(CROSSGUID_ARCHIVE_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}")
-set(CROSSGUID_FRAMEWORK_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}")
-
-set(CROSSGUID_CMAKE_CONFIG_INSTALL_DIR "${CMAKE_INSTALL_DATADIR}/crossguid/cmake")
-set(CROSSGUID_ADDITIONAL_FILES_INSTALL_DIR "${CMAKE_INSTALL_DATADIR}/crossguid")
-
 add_library(crossguid ${CMAKE_CURRENT_SOURCE_DIR}/src/guid.cpp)
 target_include_directories(crossguid PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
@@ -65,25 +55,38 @@ set_target_properties(crossguid
 					  PROPERTIES
 					  DEBUG_POSTFIX ${CMAKE_DEBUG_POSTFIX})
 
-# Install target
-install(TARGETS crossguid EXPORT crossguidTargets
-    RUNTIME       DESTINATION ${CROSSGUID_RUNTIME_INSTALL_DIR}
-    LIBRARY       DESTINATION ${CROSSGUID_LIBRARY_INSTALL_DIR}
-    ARCHIVE       DESTINATION ${CROSSGUID_ARCHIVE_INSTALL_DIR}
-    FRAMEWORK     DESTINATION ${CROSSGUID_FRAMEWORK_INSTALL_DIR})
-
-# Install headers
-install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/include/"
-    DESTINATION ${CROSSGUID_INC_INSTALL_DIR})
-
-# Make cmake config files for all targets
-install(EXPORT  crossguidTargets
-    DESTINATION ${CROSSGUID_CMAKE_CONFIG_INSTALL_DIR}
-    FILE crossguid-config.cmake)
-
-# Install readme and license
-install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE" "${CMAKE_CURRENT_SOURCE_DIR}/README.md"
-    DESTINATION ${CROSSGUID_ADDITIONAL_FILES_INSTALL_DIR})
+if (${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
+	include(GNUInstallDirs)
+
+	set(CROSSGUID_INC_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR}")
+	set(CROSSGUID_RUNTIME_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}")
+	set(CROSSGUID_LIBRARY_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}")
+	set(CROSSGUID_ARCHIVE_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}")
+	set(CROSSGUID_FRAMEWORK_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}")
+
+	set(CROSSGUID_CMAKE_CONFIG_INSTALL_DIR "${CMAKE_INSTALL_DATADIR}/crossguid/cmake")
+	set(CROSSGUID_ADDITIONAL_FILES_INSTALL_DIR "${CMAKE_INSTALL_DATADIR}/crossguid")
+
+	# Install target
+	install(TARGETS crossguid EXPORT crossguidTargets
+		RUNTIME       DESTINATION ${CROSSGUID_RUNTIME_INSTALL_DIR}
+		LIBRARY       DESTINATION ${CROSSGUID_LIBRARY_INSTALL_DIR}
+		ARCHIVE       DESTINATION ${CROSSGUID_ARCHIVE_INSTALL_DIR}
+		FRAMEWORK     DESTINATION ${CROSSGUID_FRAMEWORK_INSTALL_DIR})
+
+	# Install headers
+	install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/include/"
+		DESTINATION ${CROSSGUID_INC_INSTALL_DIR})
+
+	# Make cmake config files for all targets
+	install(EXPORT  crossguidTargets
+		DESTINATION ${CROSSGUID_CMAKE_CONFIG_INSTALL_DIR}
+		FILE crossguid-config.cmake)
+
+	# Install readme and license
+	install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE" "${CMAKE_CURRENT_SOURCE_DIR}/README.md"
+		DESTINATION ${CROSSGUID_ADDITIONAL_FILES_INSTALL_DIR})
+endif()
 
 if (CROSSGUID_TESTS)
     add_executable(crossguid-test test/TestMain.cpp test/Test.cpp)