Removed redundant install instructions

CMakeLists.txt

@@ -13,25 +13,26 @@ add_library(${PROJECT_NAME} INTERFACE)
 # add alias so the project can be uses with add_subdirectory
 add_library(${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
 
+include(GNUInstallDirs)
+
+# Adding the install interface generator expression makes sure that the include
+# files are installed to the proper location (provided by GNUInstallDirs)
 target_include_directories(
   ${PROJECT_NAME}
   INTERFACE $<BUILD_INTERFACE:${${PROJECT_NAME}_SOURCE_DIR}/include>
-            $<INSTALL_INTERFACE:include>)
+            $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
 
 target_compile_features(${PROJECT_NAME} INTERFACE cxx_std_17)
 
 enable_testing()
 add_subdirectory(test)
 
-include(GNUInstallDirs)
 # locations are provided by GNUInstallDirs
 install(TARGETS ${PROJECT_NAME}
         EXPORT ${PROJECT_NAME}_Targets
         ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
         LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-        INCLUDES
-        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 
 include(CMakePackageConfigHelpers)
 write_basic_package_version_file("${PROJECT_NAME}ConfigVersion.cmake"