Yum update ends with these messages : --> Running transaction check --> Processing Dependency: valgrind = 1:2.2.0 for package: valgrind-callgrind --> Processing Dependency: libgssapi.so.1()(64bit) for package: nfs-utils --> Processing Dependency: nfs-utils-lib for package: nfs-utils --> Processing Dependency: librpcsecgss.so.1()(64bit) for package: nfs-utils --> Processing Dependency: libnfsidmap.so.0()(64bit) for package: nfs-utils --> Restarting Dependency Resolution with new changes. --> Populating transaction set with selected packages. Please wait. ---> Package libgssapi.x86_64 0:0.8-1 set to be updated ---> Package nfs-utils-lib.x86_64 0:1.0.6-3 set to be updated --> Running transaction check --> Processing Dependency: valgrind = 1:2.2.0 for package: valgrind-callgrind --> Restarting Dependency Resolution with new changes. --> Populating transaction set with selected packages. Please wait. --> Running transaction check --> Processing Dependency: valgrind = 1:2.2.0 for package: valgrind-callgrind --> Restarting Dependency Resolution with new changes. --> Populating transaction set with selected packages. Please wait. --> Running transaction check Error: Unable to satisfy dependencies Error: Package valgrind-callgrind needs valgrind = 1:2.2.0, this is not available.