rpm -ivh gcc-c++-4.4.5-6.el6.i686.rpm
warning: rpm -ivh gcc-c++-4.4.5-6.el6.i686.rpm
warning: gcc-c++-4.4.5-6.el6.i686.rpm: Header V4 DSA signature: NOKEY, key ID 192a7d7d
error: Failed dependencies:
gcc = 4.4.5-6.el6 is needed by gcc-c++-4.4.5-6.el6.i686
libc.so.6(GLIBC_2.11) is needed by gcc-c++-4.4.5-6.el6.i686
libc.so.6(GLIBC_2.7) is needed by gcc-c++-4.4.5-6.el6.i686
libgmp.so.3 is needed by gcc-c++-4.4.5-6.el6.i686
libmpfr.so.1 is needed by gcc-c++-4.4.5-6.el6.i686
libstdc++ = 4.4.5-6.el6 is needed by gcc-c++-4.4.5-6.el6.i686
libstdc++-devel = 4.4.5-6.el6 is needed by gcc-c++-4.4.5-6.el6.i686
rpmlib(FileDigests) <= 4.6.0-1 is needed by gcc-c++-4.4.5-6.el6.i686
rpmlib(PayloadIsXz) <= 5.2-1 is needed by gcc-c++-4.4.5-6.el6.i686
我安装这个g++软件包（rpm -ivh gcc-c++-4.4.5-6.el6.i686.rpm），提示这个错误，请高手指点一二，这是什么问题？
