Added examples for svr4 /compat trees.

share/examples/svr4/README

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+INSTALLATION OF compat_* ARCHIVES
+
+This directory contains two .tar.gz archives used to populate /compat/svr4:
+
+    compat_svr4.tar.gz    - generic SysVR4 distribution
+    compat_sol26.tar.gz   - Solaris 2.6 and higher
+
+Both archives assume that you have some form of SysVR4 distribution
+mounted on /cdrom.  They should be extracted into your root directory.
+
+compat_svr4.tar.gz is intended as a template for creating additional
+OS-specific archives (as it happens, it also "just works" if you have
+a Solaris 2.5 CD-ROM mounted on /cdrom).
+
+compat_sol26.tar.gz is intended to cover the case where you have a 
+Solaris 2.6 or Solaris 7 CD-ROM mounted on /cdrom and you don't wish
+to copy the libraries onto your hard disk.
+
+If you do wish to copy the libraries onto your hard disk, you should
+start by extracting compat_svr4.tar.gz then removing the symlinks in
+/compat/svr4/usr.  Then create /compat/svr4/usr/{lib,share,...} 
+directories as needed, and copy your libraries, share-files and other
+"required" objects into them (the definition of "required" will depend
+on what, exactly, you wish to emulate).
+
+There's a Solaris executable called "hello" in this directory which 
+should produce "Hello, world!" on standard output if you have the
+basics set up correctly.
+
+    - mark newton
+      newton@atdot.dotat.org