Index: build.xml
===================================================================
--- build.xml	(revision 11373)
+++ build.xml	(working copy)
@@ -113,6 +113,7 @@
     <!-- Lisp files required at runtime -->
     <patternset id="abcl.source.lisp.dist">
       <include name="org/armedbear/lisp/boot.lisp"/>
+      <include name="org/armedbear/lisp/with-mutex.lisp"/>
     </patternset>
 
     <patternset id="abcl.objects">