If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.
 
Linux sheep 2.6.25.1 #3 Sat May 3 15:46:08 CEST 2008 i686 GNU/Linux
 
Gnu C                  4.3.0-4)
Gnu make               3.81
binutils               2.18.0.20080103
util-linux             2.13.1.1
mount                  2.13.1.1
module-init-tools      3.4
e2fsprogs              1.40.8
jfsutils               1.1.11
reiserfsprogs          3.6.19
xfsprogs               2.9.8
Linux C Library        2.7
Dynamic linker (ldd)   2.7
Procps                 3.2.7
Net-tools              1.60
Console-tools          0.2.3
Sh-utils               6.10
udev                   114
wireless-tools         29
Modules Loaded         tun vboxdrv xt_TCPMSS pppoe pppox ipt_REJECT xt_limit xt_state xt_multiport xt_tcpudp ipt_MASQUERADE iptable_nat nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_conntrack_ftp xt_conntrack nf_conntrack iptable_filter ip_tables sha256_generic ipt_ULOG x_tables nfsd lockd nfs_acl auth_rpcgss exportfs sunrpc ppp_generic slhc fuse sg sr_mod twofish_i586 twofish_common eeprom w83l785ts asb100 hwmon_vid hwmon usb_storage snd_intel8x0 snd_ac97_codec parport_pc parport ac97_bus zd1211rw snd_pcm snd_timer snd soundcore snd_page_alloc firmware_class mac80211 cfg80211 i2c_nforce2 i2c_core