added crudely worded how-to for using debian backports to install docs

diff --git a/README b/README
index 8644216..1596234 100644 (file)
--- a/README
+++ b/README
@@ -9,7 +9,17 @@ before you can successfully configure, compile, and install Evergreen.
 You can download OpenSRF releases from
 http://evergreen-ils.org/downloads
 
-2. On Debian and Ubuntu, the easiest way to install the rest of the
+2. On Debian, it's necessary to install Postgres 9 from backports.  
+
+On Squeeze, add the following line to /etc/apt/sources.list
+
+deb http://www.backports.org/debian squeeze-backports main contrib
+
+For Lenny, use lenny-backports instead.  
+
+Then run 'apt-get update'
+
+3. On Debian and Ubuntu, the easiest way to install the rest of the
 prerequisites for Evergreen is to use the Makefile.install prerequisite
 installer.