If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.
 
Linux khufu 4.0.9-khufu-0 #1 SMP PREEMPT Fri Jul 24 21:03:02 EDT 2015 x86_64 GNU/Linux
 
Gnu C                  4.9.3
Gnu make               4.0
binutils               2.25
util-linux             2.26.2
mount                  debug
module-init-tools      21
e2fsprogs              1.42.13
jfsutils               1.1.15
reiserfsprogs          3.6.24
xfsprogs               3.2.1
PPP                    2.4.6
Linux C Library        2.19
Dynamic linker (ldd)   2.19
Procps                 3.3.10
Net-tools              1.60
Kbd                    1.15.5
Sh-utils               8.23
wireless-tools         30
Modules Loaded         fuse rfcomm hidp snd_hrtimer snd_seq_dummy snd_seq_midi snd_seq_oss snd_seq_midi_event snd_seq nfnetlink_log nfnetlink bnep binfmt_misc cpufreq_powersave cpufreq_userspace cpufreq_stats vboxpci vboxnetadp cpufreq_conservative vboxnetflt vboxdrv nfsd auth_rpcgss nfs lockd grace sunrpc cfg80211 ctr twofish_generic twofish_avx_x86_64 twofish_x86_64_3way twofish_x86_64 twofish_common camellia_generic camellia_aesni_avx_x86_64 camellia_x86_64 serpent_avx_x86_64 serpent_sse2_x86_64 xts serpent_generic blowfish_generic blowfish_x86_64 blowfish_common cast5_avx_x86_64 cast5_generic cast_common cmac xcbc rmd160 sha512_ssse3 sha512_generic crypto_null nvidia snd_usb_audio uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common btusb snd_usbmidi_lib snd_hwdep snd_rawmidi bluetooth videodev media snd_seq_device joydev rfkill snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic evdev snd_hda_intel kvm_amd kvm pcspkr snd_hda_controller snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd fam15h_power k10temp drm agpgart wmi i2c_piix4 soundcore tpm_infineon tpm_tis button acpi_cpufreq it87 hwmon_vid ecryptfs sha256_ssse3 sha256_generic encrypted_keys trusted tpm loop ipv6 autofs4 btrfs xor raid6_pq algif_skcipher af_alg hid_logitech_hidpp dm_crypt dm_mod hid_logitech_dj crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd usbhid r8169 mii firewire_ohci firewire_core crc_itu_t