XFree86 4.0.3 can be found at the XFree86 ftp server, and at mirrors of this server. Information about obtaining and installing binary distributions of this release can be found in the Installation Document. Information about obtaining the release in source form is given below.
The source for version 4.0.3 is available as a patch relative to
4.0.2.
The patch file is 4.0.2-4.0.3.diff.gz.
The patch
should be applied to a clean 4.0.2 source tree, working from
the directory containing the xc/ directory. The patch should
be applied by running:
gzip -d < 4.0.2-4.0.3.diff.gz | patch -p0 -E
Information about getting the source for 4.0.2 can be found in the README file for that version, which can be found on the XFree86 web site.