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diff --git a/INSTALL b/INSTALL
index a9c673f..9568cda 100644
--- a/INSTALL
+++ b/INSTALL
@@ -186,10 +186,10 @@ does not work with some C++ compilers.
 
 =head1 Space Requirements
 
-The complete perl5 source tree takes up about 35 MB of disk space.
-After completing make, it takes up roughly 50 MB, though the actual
+The complete perl5 source tree takes up about 40 MB of disk space.
+After completing make, it takes up roughly 60 MB, though the actual
 total is likely to be quite system-dependent.  The installation
-directories need something on the order of 30 MB, though again that
+directories need something on the order of 35 MB, though again that
 value is system-dependent.
 
 =head1 Start with a Fresh Distribution
@@ -1315,12 +1315,18 @@ You will then have to rebuild by running
 	make depend
 	make
 
-=item config.over
+=item config.over and config.arch
 
-You can also supply a shell script config.over to over-ride Configure's
-guesses.  It will get loaded up at the very end, just before config.sh
-is created.  You have to be careful with this, however, as Configure
-does no checking that your changes make sense.
+You can also supply a shell script config.over to over-ride
+Configure's guesses.  It will get loaded up at the very end, just
+before config.sh is created.  You have to be careful with this,
+however, as Configure does no checking that your changes make sense.
+This file is usually good for site-specific customizations.
+
+There is also another file that, if it exists, is loaded before the
+config.over, called config.arch.  This file is intended to be per
+architecture, not per site, and usually it's the architecture-specific
+hints file that creates the config.arch.
 
 =item config.h
 
@@ -1402,7 +1408,7 @@ including a glossary of all those config.sh variables, is in the Porting
 subdirectory.  Especially Porting/Glossary should come in handy.
 
 Ports for other systems may also be available.  You should check out
-http://www.perl.com/CPAN/ports for current information on ports to
+http://www.cpan.org/ports for current information on ports to
 various other operating systems.
 
 If you plan to port Perl to a new architecture study carefully the
@@ -1919,6 +1925,15 @@ things like:  exec, `backquoted command`, system, open("|...") or
 open("...|").  All these mean that Perl is trying to run some
 external program.
 
+=item Timing problems
+
+Several tests in the test suite check timing functions, such as
+sleep(), and see if they return in a reasonable amount of time.
+If your system is quite busy and doesn't return quickly enough,
+these tests might fail.  If possible, try running the tests again with
+the system under a lighter load.  These tests include F<t/op/alarm.t>,
+F<ext/Time/HiRes/HiRes.t>, and F<lib/Benchmark.t>.
+
 =item Out of memory
 
 On some systems, particularly those with smaller amounts of RAM, some