* Support '-x xsrcdir' to tar up xsrcdir as xsrc.tgz, with the
contents of the tarfile being relative to xsrcdir and
prefixed with 'usr/xsrc'
* Convert to getopts a la the other scripts in this directory
Makefile
* if ${MKX11} != no, call makesrctars with '-x ${X11SRCDIR}'
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