Instructions for Linux 1- install fltk. The installation is very straightforward

The installation is very straightforward.

Download the source code (bz2 or gz) from http://www.fltk.org/software.php and save it to your home folder.
I would recommend version 1.1.7 to avoid any incompatibility.

The '#' sign at the beginning of each command is just to indicate that it is a command. Do not enter the '#' sign on your Linux or Unix command line; only enter what follows the '#' sign. All commands to be typed at the Linux or Unix prompt will be highlighted in green to avoid confusion.

Enter your home folder
# cd ~

Untar the FLTK source

Change to the FLTK folder

Configure the makefile, compile the source code and install (you must be root to install, or else use sudo)

The glue code is code written to make it easy for us students to use FLTK. Without it you will not be able to compile any of the code in the book, since that code does not use the FLTK implementation directly.

Point your browser to http://courses.cs.tamu.edu/daugher/cpsc121/06fall/std_lib_facilities.h, and scroll down to the code section.
Create a folder named 'project' in your home folder

# cd ~
# mkdir project

Download the files below and save them inside the project folder.

std_lib_facilities.h
fltk.h
Graph.h
Graph.cpp
Window.h
Window.cpp
Point.h
GUI.cpp
GUI.h

Create the object files Graph.o, Window.o and GUI.o

Congratulations, you have just completed the installation of FLTK for this class!

To be able to compile a graphics program using the glue files you need to put the code in the same directory where we previously downloaded, the 'project' folder. But this can be very messy.

#include "../Window.h"

This insures that g++ finds the necessary glue code. Here is an example:

Create a subfolder 'sample' in the 'project' folder'
# mkdir sample

Download  sample_main2.cpp from  http://courses.cs.tamu.edu/daugher/cpsc121/06fall/std_lib_facilities.h in the code section and save it inside the sample directory. Change the include directives as noted above. Now compile it with the command

# g++ -o sample_main2 GUI.o Window.o Graph.o sample/sample_main2.cpp -lfltk -lXft
Note: Always put the -lfltk -lXft at the end along with any other libraries you might need (-lm for math, etc.); otherwise, you will end up with a lot of unknown symbol error messages.

Run it.
# ./sample_main2

If you decide instead to install FLTK using a package manager such as 'emerge' under gentoo Linux, make sure to do the following for g++ to find the include files:

For Debian, Redhat or any other Linux distribution, I do not know where FLTK will be installed using their package manager. In any case you can always find out where the include files were installed and make a soft link to it inside your g++ include folder.

To compile a program from class the command will now be

# g++ -o sample_main2 GUI.o Window.o Graph.o sample/sample_main2.cpp -lfltk -lXft -L/usr/lib/fltk-1.1