Oke i think we are going nearer to the solution^^
Now i get
[root@server18 ~]# yum install autoconf automake
Geladene Plugins: fastestmirror
Loading mirror speeds from cached hostfile
* atomic: www4.atomicorp.com
* epel: mirror.netweaver.uk
* remi-safe: remi.mirror.ate.info
Kein Paket...