diff --git a/ChangeLog b/ChangeLog
index 4bf6b25b06..c5fbf356c6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2001-01-30  John Levon  <moz@compsoc.man.ac.uk>
+
+	* INSTALL: mention build problem with older xforms
+
 2001-01-25  John Levon  <moz@compsoc.man.ac.uk>
 
 	* autogen.sh: add qt2.m4
diff --git a/INSTALL b/INSTALL
index 77f1bb7003..3247d8d825 100644
--- a/INSTALL
+++ b/INSTALL
@@ -305,6 +305,14 @@ notify us.
 	are needed for compilation). A 'make symlinks' in linux kernel
 	sources fixes that. 
 
+  o if you get an error message when compiling LyX that looks like this :
+
+    ../../src/minibuffer.h:17: using directive `Object' introduced
+    ambiguous type `_ObjectRec *'
+
+    then you need to upgrade the version of the xforms library you have
+    installed.
+
   o If you have GNU gettext installed on your system (e.g. on linux),
     you will get tons of warnings like: