The program uses the GSL (Gnu Scientific Library): version 1.2 is good,
but 0.x is certainly not good (the dilogarithm function, necessary for
computing volumes, is used from that library).  The exact version of the
gsl (if installed) in your computer can be found by typing

> gsl-config --version

To use the program named 'ographs', download the file 'ographs.tar', 
and then type

> tar -xf ographs.tar

to extract the files from the archive. Then enter the new directory with

> cd ographs

and compile everything with

> make

Now you can watch and modify appropriately the file 'triangulation', which
contains an example of a triangulation, in an enshortened SnapPea format 
which the program 'ographs' can read. After that, type

> ./ographs triangulation

The program tries to find the angles of a geometric decomposition. If it 
succeeds, it shows the triangulation, angles, volumes, tilts, and some 
more topological information about the manifold like homology, boundary, 
a presentation of the foundamental group.

After that, it tries to canonize the triangulation. If it succeds, it 
shows the canonical triangulation.