diff --git a/ChangeLog b/ChangeLog
index 7bd2801b05..a8fe92c908 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jun 23 11:17:24 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* Makefile.in, common.mk, {win,bcc}32/Makefile.sub (revision.h): auto
+	  update.  [ruby-core:17373]
+
 Sun Jun 22 14:16:28 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/readline/extconf.rb (have_readline_func): readline on Mac OS X
diff --git a/Makefile.in b/Makefile.in
index 38bbe24874..044b758820 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -201,3 +201,10 @@ test-rubyspec:
 	@if [ ! -d $(srcdir)/rubyspec ]; then echo No rubyspec here.  make update-rubyspec first.; exit 1; fi
 	$(RUNRUBY) $(srcdir)/rubyspec/mspec/bin/mspec -r$(srcdir)/ext/purelib.rb $(srcdir)/rubyspec/spec/rubyspec/$(MAJOR).$(MINOR)
 
+
+$(srcdir)/revision.h: revision.h.tmp
+	@if [ -f "$@" ] && { [ ! -s $? ] || cmp "$@" $? >/dev/null; }; then \
+	  $(RM) $?; \
+	else \
+	  mv -f $? "$@"; \
+	fi
diff --git a/bcc32/Makefile.sub b/bcc32/Makefile.sub
index 713b5c69df..651107dee9 100644
--- a/bcc32/Makefile.sub
+++ b/bcc32/Makefile.sub
@@ -61,6 +61,7 @@ AR = tlib
 
 PURIFY =
 AUTOCONF = autoconf
+IFCHANGE = $(srcdir:/=\)\win32\ifchange.bat
 RM = $(srcdir:/=\)\win32\rm.bat
 
 !if !defined(PROCESSOR_ARCHITECTURE)
@@ -201,6 +202,9 @@ rubyw: $(WPROGRAM)
 
 !include $(srcdir)/common.mk
 
+revision.h: revision.h.tmp
+	@$(IFCHANGE) "$(srcdir)/$@" "revision.h.tmp"
+
 $(MKFILES): $(srcdir)/bcc32/Makefile.sub $(srcdir)/bcc32/configure.bat $(srcdir)/bcc32/setup.mak
 	$(COMSPEC) /C $(srcdir:/=\)\bcc32\configure.bat $(configure_args)
 	@echo $(MKFILES) should be updated, re-run $(MAKE).
@@ -216,7 +220,7 @@ config: config.status
 config.status: $(CONFIG_H)
 
 $(CONFIG_H): $(MKFILES) $(srcdir)/bcc32/Makefile.sub
-	@$(srcdir:/=\)\win32\ifchange.bat config.h &&|
+	@$(IFCHANGE) config.h &&|
 \#define HAVE_SYS_TYPES_H 1
 \#define HAVE_SYS_STAT_H 1
 \#define HAVE_STDLIB_H 1
diff --git a/bcc32/setup.mak b/bcc32/setup.mak
index 483292ed51..13a6539586 100644
--- a/bcc32/setup.mak
+++ b/bcc32/setup.mak
@@ -84,6 +84,7 @@ $(BANG)endif
 
 -version-: nul
 	@cpp32 -I$(srcdir) -P- -o$(MAKEFILE) > nul &&|
+\#define RUBY_REVISION 0
 \#include "version.h"
 MAJOR = RUBY_VERSION_MAJOR
 MINOR = RUBY_VERSION_MINOR
diff --git a/common.mk b/common.mk
index a4c9b7039a..39420cf60b 100644
--- a/common.mk
+++ b/common.mk
@@ -78,6 +78,8 @@ PRE_LIBRUBY_UPDATE = $(MINIRUBY) -e 'ARGV[1] or File.unlink(ARGV[0]) rescue nil'
 TESTSDIR      = $(srcdir)/test
 TESTWORKDIR   = testwork
 
+VCS           = svn
+
 all: $(MKFILES) $(PREP) $(RBCONFIG) $(LIBRUBY)
 	@$(MINIRUBY) $(srcdir)/ext/extmk.rb --make="$(MAKE)" $(EXTMK_ARGS)
 prog: $(PROGRAM) $(WPROGRAM)
@@ -464,7 +466,12 @@ variable.$(OBJEXT): {$(VPATH)}variable.c {$(VPATH)}ruby.h config.h \
   {$(VPATH)}env.h {$(VPATH)}node.h {$(VPATH)}st.h {$(VPATH)}util.h
 version.$(OBJEXT): {$(VPATH)}version.c {$(VPATH)}ruby.h config.h \
   {$(VPATH)}defines.h {$(VPATH)}intern.h {$(VPATH)}missing.h \
-  {$(VPATH)}version.h
+  {$(VPATH)}version.h {$(VPATH)}revision.h
 
 dist: $(PROGRAM)
 	$(RUNRUBY) $(srcdir)/distruby.rb
+
+revision.h.tmp: $(REVISION_FORCE)
+	@set LC_MESSAGES=C
+	-@$(SET_LC_MESSAGES) $(VCS) info "$(srcdir)" | \
+	sed -n "s/.*Rev:/#define RUBY_REVISION/p" > "$@"
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 1301d86fff..e632b067e6 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -57,6 +57,7 @@ YACC = byacc
 AR = lib -nologo
 PURIFY =
 AUTOCONF = autoconf
+IFCHANGE = $(COMSPEC) /C $(srcdir:/=\)\win32\ifchange.bat
 RM = $(COMSPEC) /C $(srcdir:/=\)\win32\rm.bat
 
 !if !defined(PROCESSOR_ARCHITECTURE)
@@ -261,6 +262,9 @@ rubyw: $(WPROGRAM)
 
 !include $(srcdir)/common.mk
 
+revision.h: revision.h.tmp
+	@$(IFCHANGE) "$(srcdir)/$@" "revision.h.tmp"
+
 $(MKFILES): $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub $(win_srcdir)/configure.bat $(win_srcdir)/setup.mak
 	$(COMSPEC) /C $(win_srcdir:/=\)\configure.bat $(configure_args)
 	@echo $(MKFILES) should be updated, re-run $(MAKE).
@@ -280,7 +284,7 @@ BANG = !
 
 $(CONFIG_H): $(MKFILES) $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub
 	@echo Creating config.h
-	@$(COMSPEC) /C $(srcdir:/=\)\win32\ifchange.bat config.h <<
+	@$(IFCHANGE) config.h <<
 #if _MSC_VER != $(MSC_VER)
 #error MSC version unmatch: _MSC_VER: $(MSC_VER) is expected.
 #endif
diff --git a/win32/ifchange.bat b/win32/ifchange.bat
index 4fca646ea2..8411099020 100755
--- a/win32/ifchange.bat
+++ b/win32/ifchange.bat
@@ -1,13 +1,23 @@
 @echo off
 :: usage: ifchange target temporary
 
+if "%1" == "" goto :end
+
+set dest=%1
+set src=%2
+set dest=%dest:/=\%
+set src=%src:/=\%
+if not "%dest%" == "" if not "%dest%" == "%%dest:/=\%%" goto :nt
+
+if not exist %2 goto :end
+
 :: check if fc.exe works.
-echo foo > conftest1.tmp
-echo bar > conftest2.tmp
-fc.exe conftest1.tmp conftest2.tmp > nul
+echo foo > conftst1.tmp
+echo bar > conftst2.tmp
+fc.exe conftst1.tmp conftst2.tmp > nul
 if not errorlevel 1 goto :brokenfc
-del conftest1.tmp > nul
-del conftest2.tmp > nul
+del conftst1.tmp > nul
+del conftst2.tmp > nul
 
 :: target does not exist or new file differs from it.
 if not exist %1 goto :update
@@ -27,6 +37,23 @@ echo assuming %1 should be changed.
 
 :update
 echo %1 updated.
-if exist %1 del %1
-copy %2 %1 > nul
+:: if exist %1 del %1
+dir /b %2
+copy %2 %1
+del %2
+goto :end
+
+:nt
+if not exist %src% goto :end
+if exist %dest% (
+    fc.exe %dest% %src% > nul && (
+	echo %dest% unchanged.
+	del %src%
+	goto :end
+    )
+)
+echo %dest% updated.
+copy %src% %dest% > nul
+del %src%
+
 :end
diff --git a/win32/setup.mak b/win32/setup.mak
index 1df2e2ed33..18a0ef7596 100644
--- a/win32/setup.mak
+++ b/win32/setup.mak
@@ -117,6 +117,7 @@ int main(int argc, char **argv)
 -version-: nul
 	@$(APPEND)
 	@$(CPP) -I$(srcdir) <<"Creating $(MAKEFILE)" | find "=" >>$(MAKEFILE)
+#define RUBY_REVISION 0
 #include "version.h"
 MAJOR = RUBY_VERSION_MAJOR
 MINOR = RUBY_VERSION_MINOR