Joerg Sonnenberger has posted the results of his new pbulk system, for bulk builds of pkgsrc, on the tech-pkg@netbsd.org mailing list.  His test bed is building DragonFly, so the results show just how many packages build on DragonFly. The report comes in text and graphical (warning: big!) versions too.
An interesting corollary to this, from reading the reports, is that out of 7,213 packages in pkgsrc, only 167 actually fail to build on DragonFly – that’s only 2% broken. There are other packages that fail due to dependencies on those broken packages, but it’s still a remarkably good percentage.