Martin, I've built non-official Xorg X11 SDKs (X11 headers and libraries for Solaris 8/9/10/11 software development.
As Alan mentioned, you can also get the source files from Xorg. Sun Solaris official distros 'usually' don't come with the full suite of X11 headers and libraries by default. This may change in the future. Ken Mays EarthLink, Inc. This message posted from opensolaris.org
