diff --git a/0BUILD b/0BUILD
index 90f4052..2062f73 100644
--- a/0BUILD
+++ b/0BUILD
@@ -61,6 +61,13 @@
     </ifVarMatches>
 
 
+    <!-- use "-Owith_avr=TRUE" or "FALSE" to enable or disable assembling AVR code -->
+    <option id="with_avr" type="string">
+      <default>TRUE</default>
+      <choices>TRUE FALSE</choices>
+    </option>
+
+
     <checkheaders>
       signal.h
       sys/stat.h
@@ -101,11 +108,17 @@
 
 
     <subdirs>
-      avr
       aqhome
       apps
     </subdirs>
 
+    <ifVarMatches name="option_with_avr" value="TRUE" >
+      <subdirs>
+        avr
+      </subdirs>
+    </ifVarMatches>
+
+
 
 
     <!-- build with "gwbuild -B flash" -->