[GRASS5] Grass 5.1's Directed Graph Library CVS snapshot

[Greg Sepesi]

I downloaded this week's CVS snapshot of the Directed Graph Library. 
The snapshot seems to be missing shortest_path.c (referenced in
Makefile.alone) which I would like to read in an attempt to understand
the choice of an AVL tree to implement the TREE state (as opposed to the
FLAT state) of GRASS 5.1 directed graphs.  Where can I find
shortest_path.c?

Regards,
Greg