README.md

@@ -2,16 +2,38 @@
 
 ## How to use
 
-Install dependencies:  libdpkg-perl libwww-mechanize-perl sbuild
+Usage:
 
-Create a non-privileged user in the sbuild group (e.g. "buildd")
+    repro-build.pl <buildinfo>
 
-Install repro-build.pl and sbuild.sh into that user's home directory
-(e.g. "/home/buildd")
+## Prerequisites
 
-Usage:
+Install dependencies:
 
-    repro-build.pl <buildinfo>
+    apt install debootstrap sbuild schroot \
+     libdpkg-perl libwww-mechanize-perl
+
+Create a non-privileged user in the sbuild group (e.g. "buildd"):
+
+    adduser --disabled-password --gecos ',,,' buildd
+    adduser buildd sbuild
+
+Copy or link repro-build.pl and sbuild.sh into that user's home
+directory (e.g. "/home/buildd").
+
+If you don't already have one, create and configure a chroot for
+schroot:
+
+    sbuild-createchroot unstable /srv/chroot/unstable
+
+### Optional
+
+Installing a local Squid proxy avoids repeated queries to
+snapshots.debian.org and thus increases overall speed:
+
+    apt-get install squid3
+    service squid start
+    export http\_proxy=http://localhost:3128
 
 ## Known issues