Version 0.71 Installation Procedure for K12Linux 
(Fedora based LTSP 5))

Special thanks to Peter Scheie for helping me figure stuff out.

Install fltk 

#yum install fltk fltk-devel
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We need vncviewer so install vnc or tigervnc (fedora 11)
#yum install vnc
or 
#yum install tigervnc
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Next you need to get vncreflector 1.2.4 tarball from sourceforge.net
http://sourceforge.net/projects/vnc-reflector/files/
(Note: The vncreflector package in Fedora seems broken)
You will first need package libjpeg-devel to compile vnc-reflector

#yum install libjpeg-devel

Then compile vncreflector with make.

Simply, cp the vncreflector binary to /usr/bin
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Next you need tightvnc source from here
http://sourceforge.net/projects/vnc-tight/files/TightVNC-unix/1.3.10/

Here are the packages you will need before you compile tightvnc

 imake
 
 libXmu-devel
    libICE-devel
    libSM-devel
    libXt-devel
    xorg-x11-util-macros
    
 libXaw-devel
 
 to compile, follow the install instructions in the README
 
 xmkmf
 make World

Now all you need are two files. 
cp vncviewer binary to /usr/bin but rename it to teachertool-vncviewer
cp vncpasswd binary to /usr/bin but rename it to teachertool-vncpasswd
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Next make sure you have ImageMagick and gthumb installed
(you probably already do)
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Next you need vncsnapshot 1.2a source tarball from sourceforge
http://sourceforge.net/projects/vncsnapshot/files/vncsnapshot/1.2a/vncsnapshot-1.2a-Linux-x86.tar.gz
Compile it with make and just cp the vncsnapshot binary to /usr/bin
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Next do 
#yum  install  xscreensaver-base
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You also need x11vnc and openssh-server inside the ltsp tree. 
I got the x11vnc rpm from here
http://packages.sw.be/x11vnc/

You can install x11vnc and openssh-server like this:
chroot /opt/ltsp/i386
mount /proc

(Note: Fedora 9/10 do not have x11vnc rpm packages so I used the following website)
rpm -ivh http://packages.sw.be/x11vnc/x11vnc-0.9.5-1.fc10.rf.i386.rpm

(However, Fedora 11 or newer now has x11vnc, so you can install it with yum)
yum install x11vnc

yum install openssh-server
chkconfig sshd on
service sshd start
umount /proc
exit

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Now edit /opt/ltsp/i386/etc/ssh/sshd_config
and add in the appropriate place

PasswordAuthentication no

to prevent password ssh logins
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Now make a file called /opt/ltsp/i386/etc/x11vnc-script
in it put the following 2 lines 

#!/bin/bash
/usr/bin/x11vnc  -rfbauth /tmp/fl_tt_xvncpasswd -cursor arrow -forever -display :1  -auth $(ps -ef | grep [-]auth | grep xinit |awk '{print $15}')

give it the correct permissions
#chmod 755 /opt/ltsp/i386/etc/x11vnc-script
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Next create an ssh key pair without a passphrase for root.

#ssh-keygen -t rsa -b 2048
just hit enter when it asks for a passphrase.
Now you want to be careful with this next part
-make sure the private key has permission 600
chmod 600 /root/.ssh/id_rsa
next you want to copy paste the public key

#cat /root/.ssh/id_rsa.pub

it should look something like this (I have replaced the key with .....)

ssh-rsa ........ 


In file /opt/ltsp/i386/etc/rc.local 
add the following 2 lines:

mkdir -p /root/.ssh
echo 'ssh-rsa .....'  >  /root/.ssh/authorized_keys
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You now have to setup xinetd start vncserver:

1. Update gdm via yum:
yum update gdm 

2. Install vnc-ltsp-config via yum:
yum install vnc-ltsp-config

3. Edit /etc/gdm/custom.conf, add 'Enable=true' under [xdmcp], i.e.,

       [xdmcp]
       Enable=true

4. Turn on vncts in xinetd via chkconfig:
       chkconfig vncts on

5. Reboot server, to restart gdm.  
Logging out used to do this, as did running gdmrestart, but neither seems to work.

6. Reboot clients at this point also.



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Next (as root of course) 

mkdir  -p  /usr/local/etc/fl_teachertool/teacher
chmod  700  /usr/local/etc/fl_teachertool/teacher

Now create a new file
vim  /usr/local/etc/fl_teachertool/teacher/vncreflectorpass

inside this file you should type two passwords like this

fullcontrolpassword
viewonlypassword

You make up your own passwords. They should be in plain text.
Then
chmod 600  /usr/local/etc/fl_teachertool/teacher/vncreflectorpass


Now you need to create the encrypted versions of these plain text passwords
Again as root issue the command:

teachertool-vncpasswd  /usr/local/etc/fl_teachertool/teacher/teacherpass

Now only type in *one* password. 
The one you typed in the first line of vncreflectorpass (eg fullcontrolpassword)
Now
chmod 600  /usr/local/etc/fl_teachertool/teacher/teacherpass

Next
teachertool-vncpasswd  /usr/local/etc/fl_teachertool/clientpass

Note: the dir is *not* the same as teacherpass 
Again only type in *one* password. 
The one you typed in the second line of vncreflectorpass (eg viewonlypassword)

Now 
chmod  644  /usr/local/etc/fl_teachertool/clientpass

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Now you can install fl_teachertool (untar the tarball) 
you may still need libXpm-devel and libpng-devel package so install
those first with yum, then

make
#make install
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Last thing:
Make your broadcast windows bigger than 800x600
I prefer 1024x768 broadcast windows

vim /etc/xinetd.d/vncts

change 16bit 800x600 to 1024x768

#service xinetd restart

That's it. Don't forget to configure 
/usr/local/etc/fl_teachertool/fl_teachertool.conf
if you have multiple rooms (or wish to divide classrooms into sections)

If you are not sure how to configure it read the docs here
http://www3.telus.net/public/robark/Fl_TeacherTool/documentation.html
Specifically the last 2 sections.

Enjoy!!!!!!!!!