/usr/local/lib/gcc/i686-pc-linux-gnu/4.9.0/include
/usr/local/include
/usr/local/lib/gcc/i686-pc-linux-gnu/4.9.0/include-fixed
/usr/include/i386-linux-gnu
/usr/include
/usr/local/include/c++/4.9.0/backward
/usr/local/include/c++/4.9.0/i686-pc-linux-gnu
/usr/local/include/c++/4.9.0
解析stl需要这些头文件路径