Manuale: http://doc.async.com.br/jpgraph/html/index.html
Controllo: andare sul proprio php-info.php e controllare se la versione php è corretta e se le GD sono enabled.
Installazione: con Debian è stato facile trovare i pacchetti con dselect (libphp-jpgraph).
Check post-installazione: controllato con dpkg -L dove sono i nuovi file.

idrogeno:/# dpkg -l | grep jpgraph
ii  libphp-jpgraph                                          1.5.2-11+u1
                   Object oriented graph library for php4
ii  libphp-jpgraph-examples                                 1.5.2-11+u1
idrogeno:/# dpkg -L libphp-jpgraph
/usr/share/jpgraph/jpgraph_error.php
/usr/share/jpgraph/jpgraph_spider.php
/usr/share/jpgraph/jpgraph_canvas.php
/usr/share/jpgraph/jpgraph_pie3d.php
/usr/share/jpgraph/jpgraph_scatter.php
/usr/share/jpgraph/jpgraph_dir.php
/usr/share/jpgraph/jpgraph_bar.php
/usr/share/jpgraph/jpgraph_line.php
/usr/share/jpgraph/jpgraph_log.php
/usr/share/jpgraph/jpgraph_pie.php
/usr/share/jpgraph/jpgraph.php
/usr/share/jpgraph/jpgraph_gantt.php
[...]
/usr/share/doc/libphp-jpgraph/README.gz
[...]

Gli esempi sono in:

/usr/share/doc/libphp-jpgraph-examples/*

Poi ho provato questo esempio includendo i miei percorsi alle librerie:

include ("/usr/share/jpgraph/jpgraph.php" );
include ("/usr/share/jpgraph/jpgraph_pie.php");

All done!

[Edit 090225: Warning; Debian è rimasta a jpgraph versione 1.5.2-11 causa cambio licenza e l'aggiornamento non è presente nei repo non-free. Scaricare dal sito ufficiale la versione aggiornata. ]

Linux
Apache
MySQL
Php (e altro, nel mio caso)

Sottofondo musicale: OST dei Transformer. Da paura.

1. Linkin Park – What I’ve Done
2. Smashing Pumpkins – Doomsday Clock
3. Disturbed – This Moment
4. Goo Goo Dolls – Before It’s Too Late (Sam And Mikaela’s Theme)
5. The Used – Pretty Handsome Awkward
6. HIM – Passion’s Killing Floor
7. Taking Back Sunday – What It Feels Like To Be A Ghost?
8. Styles Of Beyond Feat. Mike Shinoda – Second To None
9. Armor For Sleep – End Of The World
10. Idiot Pilot – Retina And The Sky
11. Julien-K – Technical Difficulties
12. Mutemath – Transformers Theme