Improve install guide

Add command for updating the list of cabal packages, before starting
installing them.

Signed-off-by: Michele Tartara <mtartara@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

diff --git a/INSTALL b/INSTALL
index 6238416..c2978b3 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -166,6 +166,7 @@ If using a distribution which does not provide them, first install
 the Haskell platform. You can also install ``cabal`` manually::
 
   $ apt-get install cabal-install
+  $ cabal update
 
 Then install the additional libraries via
 ``cabal``::