diff --git a/chapter07/python.xml b/chapter07/python.xml
index 68a02dd8c..d25432d1f 100644
--- a/chapter07/python.xml
+++ b/chapter07/python.xml
@@ -80,6 +80,19 @@
 
 <screen><userinput remap="make">make</userinput></screen>
 
+    <note>
+      <para>
+        Some Python 3 modules can't be built now because the dependencies
+        are not installed yet. The building system still attempts to build
+        them however, so the compilation of some files will fail and the
+        compiler message may seem to indicate <quote>fatal error</quote>.
+        The message should be ignored.  Just make sure the toplevel
+        <command>make</command> command has not failed.  The optional
+        modules are not needed now and they will be built in
+        <xref linkend="chapter-building-system"/>.
+      </para>
+    </note>
+
     <para>Install the package:</para>
 
 <screen><userinput remap="install">make install</userinput></screen>