i did it , and rpmforge added
such an error

Resolving Dependencies
--> Running transaction check
---> Package openvpn.i386 0:2.1.4-1.el5.rf set to be updated
--> Processing Dependency: liblzo2.so.2 for package: openvpn
--> Finished Dependency Resolution
openvpn-2.1.4-1.el5.rf.i386 from rpmforge has depsolving problems
  --> Missing Dependency: liblzo2.so.2 is needed by package openvpn-2.1.4-1.el5.rf.i386 (rpmforge)
Error: Missing Dependency: liblzo2.so.2 is needed by package openvpn-2.1.4-1.el5.rf.i386 (rpmforge)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.