Use GNUInstallDirs for standard conforming install target.

CMakeLists.txt

@@ -121,18 +121,14 @@ endif()
 add_library(dmlc ${SOURCE})
 target_link_libraries(dmlc ${dmlccore_LINKER_LIBS})
 
-# ---[ Install Includes
-if(INSTALL_INCLUDE_DIR)
-  add_custom_command(TARGET dmlc POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E copy_directory
-    ${PROJECT_SOURCE_DIR}/include ${INSTALL_INCLUDE_DIR}/
-    )
-endif()
-
 # ---[ Install the archive static lib and header files
-install(TARGETS dmlc ARCHIVE DESTINATION lib) 
-install(DIRECTORY include DESTINATION .)
-install(DIRECTORY doc DESTINATION .)
+include(GNUInstallDirs)
+install(TARGETS dmlc
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+install(DIRECTORY include/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+install(DIRECTORY doc/ DESTINATION ${CMAKE_INSTALL_DATADIR}/doc/${PROJECT_NAME})
 
 # ---[ Linter target
 if(MSVC)