Index: Makefile.in
===================================================================
--- Makefile.in	(revision 27107)
+++ Makefile.in	(working copy)
@@ -159,6 +159,18 @@
 	  cp $(srcdir)/lex.c $@ && echo $@ copied.; \
 	fi
 
+$(srcdir)/revision.h:
+	@exit > $@
+
+$(REVISION_H): $(srcdir)/version.h $(srcdir)/ChangeLog revision.h.tmp $(REVISION_FORCE)
+	@if [ -f $(srcdir)/revision.h ] && \
+	    { [ ! -s revision.h.tmp ] || cmp $(srcdir)/revision.h revision.h.tmp >/dev/null; }; then \
+	  $(RM) revision.h.tmp; \
+	else \
+	  mv -f revision.h.tmp $(srcdir)/revision.h; \
+	fi
+	@exit > $@
+
 .y.c:
 	$(YACC) $<
 	sed '/^#/s|y\.tab\.c|$@|' y.tab.c > $@
Index: common.mk
===================================================================
--- common.mk	(revision 27107)
+++ common.mk	(working copy)
@@ -482,24 +482,9 @@
 dist: $(PROGRAM)
 	$(RUNRUBY) $(srcdir)/distruby.rb
 
-$(srcdir)/revision.h:
-	@exit > $@
-
-$(REVISION_H): $(srcdir)/version.h $(srcdir)/ChangeLog revision.h.tmp $(REVISION_FORCE)
-	@if [ -f $(srcdir)/revision.h ] && \
-	    { [ ! -s revision.h.tmp ] || cmp $(srcdir)/revision.h revision.h.tmp >/dev/null; }; then \
-	  $(RM) revision.h.tmp; \
-	else \
-	  mv -f revision.h.tmp $(srcdir)/revision.h; \
-	fi
-	@exit > $@
-
 revision.h.tmp: $(REVISION_FORCE)
 	@set LC_MESSAGES=C
-	-@{ cd "$(srcdir)" && $(SET_LC_MESSAGES) $(VCS) info | \
-	sed -n \
-	  -e '/^URL:/{' -e '/\/trunk$$/d' -e 's!.*/\([^/][^/]*\)$$!#define RUBY_BRANCH_NAME "\1"!p' -e '}' \
-	  -e "s/.*Rev:/#define RUBY_REVISION/p"; } > "$@"
+	-@cd "$(srcdir)" && $(SET_LC_MESSAGES) $(VCS) info | sed -n -f "$(srcdir)/revision.sed" > "$@"
 -IF-NO-STRING-LITERAL-CONCATENATION-::
 	@{ \
 	echo '#include "$@"'; \
Index: revision.sed
===================================================================
--- revision.sed	(revision 0)
+++ revision.sed	(revision 0)
@@ -0,0 +1,5 @@
+/^URL:/{
+:/trunk$:d
+s:.*/\([^/]\+\)$:#define RUBY_BRANCH_NAME "\1":p
+}
+s/.*Rev:/#define RUBY_REVISION/p