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diff --git a/NOTES b/NOTES
index 2e5c6b9..4fe9e6c 100644
--- a/NOTES
+++ b/NOTES
@@ -335,3 +335,17 @@ Platform-Specific Configuration and Operation Notes
 17.  Do NOT use bison-1.75.  It builds a non-working parser.  The most
      obvious effect is that constructs like "for i; do echo $i; done" don't
      loop over the positional parameters.
+
+18.  I have received reports that using -O2 with the MIPSpro results in a
+     binary that fails in strange ways.  Using -O1 seems to work.
+
+19.  There is special handling to ensure the shell links against static
+     versions of the included readline and history libraries on Mac OS X;
+     Apple ships inadequate dynamic libreadline and libhistory "replacements"
+     as standard libraries.
+
+20.  If you're on a system like SGI Irix, and you get an error about not
+     being able to refer to a dynamic symbol
+     (ld: non-dynamic relocations refer to dynamic symbol PC), add
+     -DNEED_EXTERN_PC to the LOCAL_CFLAGS variable in lib/readline/Makefile.in
+     and rebuild.