--- tools/build/v2/tools/qt4.jam.org    Fri Jun 10 13:31:38 2011
+++ tools/build/v2/tools/qt4.jam        Fri Jun 10 13:35:35 2011
@@ -667,7 +667,7 @@
 #
 actions moc
 {
-    $(.BINPREFIX[-1])/moc -I"$(INCLUDES)" -D$(DEFINES) -f $(>) -o $(<)
+    $(.BINPREFIX[-1])/moc @"@($(<).mocrsp:E=-I"$(INCLUDES)" -D$(DEFINES))" -f $(>) -o $(<)
 }