CentOS 6.4 rpm requires el5 but available is only el6 I want to install `lipXp-devel-1.0.0-8.1.el5.i386.rpm` and get the error message: > Package: lipXp-devel-1.0.0-8.1.el5.i386 > Requires: libXp = 1.0.0-8.1.el5 > Installed: libXp-1.0.0-15.1.el6.i686 How can I install the the rpm?

No you are misjudging it. Your rpm file version is older and you have installed CentOS6.4 requires el6 package, which is NOT compatible to your system.

You need to install `lipXp-devel` package compatible to your installed `libXp-1.0.0-15.1.el6.i686` package. This package is available on rpm.pbone.net
Try installing this package.