1 files changed, 6 insertions, 0 deletions
diff --git a/README b/README
index dff9617..733aed4 100644
--- a/README
+++ b/README
@@ -40,6 +40,12 @@ Building:
 
 Get the dependencies
 
+    Firstly, you'll need the C X11 library headers. On many platforms,
+    these come pre-installed. For others, such as Debian, you can get 
+    them from your package manager:
+
+        apt-get install libx11-dev
+
     It is likely that you already have some of these dependencies.  To check
     whether you've got a package run 'ghc-pkg list some_package_name'