TESSDATA_PREFIX problem

[Dusayanta Prasad]

Please help me with this:

dusayanta@dusayanta:~/tessy$ tesseract -v

tesseract 4.00.00dev-731-gb9b08c7

 leptonica-1.75.3

  libjpeg 8d (libjpeg-turbo 1.4.2) : libpng 1.2.54 : libtiff 4.0.6 : zlib 1.2.8

 Found AVX

 Found SSE

dusayanta@dusayanta:~/tessy$ tesseract book.tif book -l eng

Error opening data file /home/dusayanta/tesseract/tessdata/eng.traineddata

Please make sure the TESSDATA_PREFIX environment variable is set to your "tessdata" directory.

Failed loading language 'eng'

Tesseract couldn't load any languages!

Could not initialize tesseract.

dusayanta@dusayanta:~/tessy$ cd ..

dusayanta@dusayanta:~$ ls tesseract/tessdata/

configs  eng.traineddata  eng.user-patterns  eng.user-words  Makefile.am  Makefile.in  pdf.ttf  tessconfigs

dusayanta@dusayanta:~$ printenv

XDG_VTNR=7

XDG_SESSION_ID=c2

CLUTTER_IM_MODULE=xim

XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/dusayanta

SESSION=ubuntu

GPG_AGENT_INFO=/home/dusayanta/.gnupg/S.gpg-agent:0:1

SHELL=/bin/bash

TERM=xterm-256color

VTE_VERSION=4205

QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1

TESSDATA_PREFIX=/home/dusayanta/tesseract/tessdata/

WINDOWID=75497482

UPSTART_SESSION=unix:abstract=/com/ubuntu/upstart-session/1000/1099

GNOME_KEYRING_CONTROL=

GTK_MODULES=gail:atk-bridge:unity-gtk-module

USER=dusayanta

[Dusayanta Prasad]

eng tessdata_fast and eng tessdata_best didn't work so i thought trying eng data in the section

Data Files for Version 4.00 (November 29, 2016)

https://github.com/tesseract-ocr/tesseract/wiki/Data-Files#data-files-for-version-400-november-29-2016

and this is working. But why not tessdata_fast and tessdata_best ??