If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.
 
Linux sid 2.6.31 #1 Mon Oct 26 21:59:43 CET 2009 x86_64 GNU/Linux
 
Gnu C                  4.3.4
Gnu make               3.81
binutils               2.20
util-linux             scripts/ver_linux: 23: fdformat: not found
mount                  support
module-init-tools      found
Linux C Library        2.10.1
Dynamic linker (ldd)   2.10.1
Procps                 3.2.8
Kbd                    loadkeys:
Sh-utils               7.5
Modules Loaded         cachefiles fuse nfs lockd fscache nfs_acl auth_rpcgss sunrpc loop