[commit: ghc] master: Make sure README.md mentions that make can build in parallel. (b4befc0)

[Austin Seipp]

Repository : http://darcs.haskell.org/ghc.git/

On branch  : master

https://github.com/ghc/ghc/commit/b4befc0611b488d77a619a7b7a34750dc6bfb786

>---------------------------------------------------------------

commit b4befc0611b488d77a619a7b7a34750dc6bfb786
Author: Austin Seipp <aseipp at pobox.com>
Date:   Fri Mar 29 14:47:42 2013 -0500

    Make sure README.md mentions that make can build in parallel.
    
    Signed-off-by: Austin Seipp <aseipp at pobox.com>

>---------------------------------------------------------------

 README.md | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 3b3a66e..5f646a4 100644
--- a/README.md
+++ b/README.md
@@ -62,9 +62,14 @@ dblatex.
 
     $ perl boot
     $ ./configure
-    $ make
+    $ make         # can also say 'make -jX' for X number of jobs
     $ make install
 
+(NB: **Do you have multiple cores? Be sure to tell that to `make`!** This can
+save you hours of build time depending on your system configuration, and is
+almost always a win regardless of how many cores you have. As a simple rule,
+you should have about N+1 jobs, where `N` is the amount of cores you have.)
+
 The `perl boot` step is only necessary if this is a tree checked out
 from git.  For source distributions downloaded from [GHC's web site] [1],
 this step has already been performed.