安装glibc-devel出错！

错误提示如下：
[root@YSC Desktop]# yum install glibc-devel
Loading "installonlyn" plugin
ftp://www.linux-ren.org/pub/redflag/dt6sp1/Update/RPMS/repodata/repomd.xml: [Errno 4] IOError: [Errno ftp error] 550 redflag: No such file or directory
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: %s. Please verify its path and try again


自己下了个glibc-devel2.9-2.i386.rpm进行安装提示如下错误：
[root@YSC Desktop]# rpm -vih glibc-devel-2.9-2.i386.rpm
warning: glibc-devel-2.9-2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 4ebfc273
error: Failed dependencies:
glibc = 2.9-2 is needed by glibc-devel-2.9-2.i386
glibc-headers = 2.9-2 is needed by glibc-devel-2.9-2.i386
请问我该如何才能安装呢？