--- bin/Makefile.orig	2010-11-24 05:29:20.000000000 +0900
+++ bin/Makefile	2010-11-24 16:19:06.587423414 +0900
@@ -28,7 +28,7 @@
 	${RUBY} -pe ' \
 		if $$. == 1; \
 		 if /^#!/; \
-		  $$_.sub(/^#!\s*\S*(\benv\s+)?\bruby/, "#!${RUBY}"); \
+		  $$_.sub!(/^#!\s*\S*(\benv\s+)?\bruby/, "#!${RUBY}"); \
 		 else; \
 		  $$_ = "#!${RUBY}\n" + $$_; \
 		 end; \
