diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8e0d2c5..922de10 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,10 +9,14 @@ ELSE()
     add_definitions("-DCPUBIT32")
 ENDIF()
 
+#在编译选项中加入c99支持
+add_compile_options(-std=c99)
+message(STATUS "optional:-std=c99") 
+
 include_directories("/usr/local/include")
 link_directories("/usr/local/lib")
 
 add_executable(simple-http-server server.c)
 target_link_libraries(simple-http-server pthread)
 
-INSTALL(TARGETS simple-http-server RUNTIME DESTINATION bin)
\ No newline at end of file
+INSTALL(TARGETS simple-http-server RUNTIME DESTINATION bin)