Index: win32/configure.bat
===================================================================
--- win32/configure.bat	(リビジョン 30231)
+++ win32/configure.bat	(作業コピー)
@@ -9,6 +9,7 @@
 echo>> ~tmp~.mak 	@del ~setup~.mak
 echo>> ~tmp~.mak 	@-$(MAKE) -l$(MAKEFLAGS) -f $(@D)/setup.mak \
 if exist pathlist.tmp del pathlist.tmp
+if exist baseruby.bat del baseruby.bat
 echo>confargs.tmp #define CONFIGURE_ARGS \
 :loop
 if "%1" == "" goto :end
@@ -147,6 +148,7 @@
 :baseruby
   echo>> ~tmp~.mak 	"BASERUBY=%~2" \
   echo>>confargs.tmp %1=%2 \
+  echo>baseruby.bat %~2 -v
   shift
   shift
 goto :loop
@@ -173,6 +175,19 @@
   del ~tmp~.mak
 goto :exit
 :end
+
+if exist baseruby.bat goto :have_baseruby
+ruby -v >NUL 2>NUL
+goto :check_bootstrapruby
+:have_baseruby
+baseruby.bat >NUL 2>NUL
+:check_bootstrapruby
+if not errorlevel 1 goto :have_bootstrapruby
+echo executable host ruby is required.  use --with-baseruby option.
+goto :exit
+:have_bootstrapruby
+if exist baseruby.bat del baseruby.bat
+
 echo>> ~tmp~.mak 	WIN32DIR=$(@D:\=/)
 echo.>>confargs.tmp
 echo>confargs.c #define $ $$