A number of fixes were committed to the DeforaOS compiler [1] a few minutes ago. They finally allowed for the introduction of the graph target plug-in [2]. For a more detailed explanation, you can actually check my blog [3].

[1] https://www.defora.org/os/project/display/890/c99
[2] http://www.defora.org/os/project/browse/890?file=/src/target/graph.c,v
[3] http://people.defora.org/~khorben/200805.html#20080520024508