only build the debug versions of the library, the optimized version takes too much memory to compile (over 1GB! on a linux box)

[SVN r11527]

libs/graph

@@ -1 +1 @@
-Subproject commit 1dd9c54a19c0726220ace03c37b970bb979fe335
+Subproject commit 398aad812f02899b43ab052e230bda6d3b5c00b5