Northern California, SF Bay Area. You even replied and quoted to my previous post with location.
It looks like RRDTools might not cross compile. It seems to want IEEE Math. I did a bit of digging, but at one time it was a port on OpenBSD for Alphas. According to the kernel maintainer, MIPS doesn't do the the true IEEE math, but should not be needed for RRDTools.
I'm also looking into SQLite if I can't get RRDTools to compile. If it RRDTools does compile, do we need the graphics libs? I guess it won't hurt, but I think it will make the tools a lot bigger. Provided there is a way to compile with out the jpeg, gd support.