Mention additional required software for working from a Git tree.

diff --git a/INSTALL b/INSTALL
index 55c562d..5a02fbd 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -50,6 +50,17 @@ To compile the datapath kernel module, you will additionally need:
       corresponding linux-headers package with the required build
       infrastructure.
 
+If you are working from a Git tree or snapshot (instead of from a
+distribution tarball), or if you modify the OpenFlow build system, you
+will also need the following software:
+
+    - Autoconf version 2.59 or later (http://www.gnu.org/software/autoconf).
+
+    - Automake version 1.10 or later (http://www.gnu.org/software/automake).  
+
+    - pkg-config (http://pkg-config.freedesktop.org/wiki/).  We test
+      with version 0.22.
+
 Building the Code
 -----------------