[Xquartz-dev] X11 developer updates?

Since I occasionally compile my own X11 programs, I was wondering if there are any updates outside the X11.app beta distribution that I should try to use, such as headers, libraries, etc., and what would be the best approach for me to update those. Or should I stick with the stock Apple development libraries. I think my X11 development environment is from the 10.5-X11 Developer distribution + 10.5.4 + 10.5.5 updates. TIA Dave