--- a/Makefile	Wed Mar 30 19:53:32 2011 +0100
+++ b/Makefile	Thu Mar 31 10:45:34 2011 +0100
@@ -66,7 +66,7 @@
 
 Makefile.depend depend:
 	$(CXX) -MM -MG -I. *.cc \
-	  | perl -pe 's/:/ Makefile.depend:/' > Makefile.depend
+	  | sed 's/:/ Makefile.depend:/' > Makefile.depend
 
 include Makefile.depend