This week a lot of work was done to get the sew-devel-2_0 branch to compile in the postGIS buildbot for windows. It looks like we have worked out most of the issues and can now compile the branch in MinGW32 and MinGW64 and for the 8 test cases that I have implemented are all running and returning consistent results with my last checkin.
There is still work to be done in this area to smooth out the process and get a the environments structured identically so we can use a common set of scripts. I also have a similar, but not the same environment setup on my system so I can test locally before submitting changes, assuming I remember to do that 
I also just fixed a bug #3 in Dijkstra code that crashes the server is you pass it negative costs. These are now detected and set to infinity in the graph. There is probably a better way to do this by eliminating the edges, but this was a quick fix to avoid the crash.
-Steve