diff --git a/CMakeLists.txt b/CMakeLists.txt
index d479481..cf4420a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,12 @@ if (${isBigEndian})
     add_definitions(-DWORDS_BIGENDIAN)
 endif()
 
+#判断编译器类型,如果是gcc编译器,则在编译选项中加入c99支持
+if(CMAKE_COMPILER_IS_GNUCXX)
+    add_compile_options(-std=c99)
+    message(STATUS "optional:-std=c99")   
+endif(CMAKE_COMPILER_IS_GNUCXX)
+
 add_library(spb SHARED protobuf.c)
 add_library(spb_static STATIC protobuf.c)
 set_target_properties(spb_static PROPERTIES OUTPUT_NAME spb)
@@ -16,4 +22,4 @@ target_link_libraries(t spb)
 
 INSTALL(TARGETS spb LIBRARY DESTINATION lib)
 INSTALL(TARGETS spb_static ARCHIVE DESTINATION lib)
-INSTALL(FILES simple_protobuf.h DESTINATION include)
\ No newline at end of file
+INSTALL(FILES simple_protobuf.h DESTINATION include)