Thanks a lot, I will look at it as soon as I find some time, even if I may not be qualified enough to help you on that.
I found that discussion that may be interesting : http://comments.gmane.org/gmane.os.openbsd.ports/72423 " libunwind depends on a libc extension called Setcontext, which i quote wikipedia <is somewhat cumbersome to use effectively>, this libc extension is present on NETBSD and FREEBSD but having this entering into openBSD libc may take a long time, even bikeshed are taking time here." Best, Antoine
