diff --git a/ChangeLog b/ChangeLog
index d0d563ed23..8b6e4e08dc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,19 @@
+Sun Sep 15 19:48:55 2002  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* configure.in (OUTFLAG, CPPOUTFILE): moved from lib/mkmf.rb.
+	  check whether ${CPP} accepts the -o option.
+
+	* win32/Makefile.sub (OUTFLAG, CPPOUTFILE): ditto.
+
+	* bcc32/Makefile.sub (OUTFLAG, CPPOUTFILE): ditto.
+
+	* djgpp/config.sed (OUTFLAG, CPPOUTFILE): ditto.
+
+	* lib/mkmf.rb (OUTFLAG, CPPOUTFILE): use CONFIG.
+	  make easy to understand log.
+
+	* mkconfig.rb (val): should not strip.
+
 Sat Sep 14 20:13:42 2002  KONISHI Hiromasa <konishih@fd6.so-net.ne.jp>
 
 	* error.c(rb_sys_fail): remove case EPIPE on bcc32 .
diff --git a/bcc32/Makefile.sub b/bcc32/Makefile.sub
index 9079210fd4..e13cfc5f52 100644
--- a/bcc32/Makefile.sub
+++ b/bcc32/Makefile.sub
@@ -338,6 +338,8 @@ s,@LIBRUBYARG@,$$(RUBY_SO_NAME).lib,;t t
 s,@SOLIBS@,$(SOLIBS),;t t
 s,@DLDLIBS@,$(DLDLIBS),;t t
 s,@ENABLE_SHARED@,yes,;t t
+s,@OUTFLAG@,-o,;t t
+s,@CPPOUTFILE@,,;t t
 s,@arch@,$(ARCH)-$(OS),;t t
 s,@sitearch@,$(ARCH)-$(OS),;t t
 s,@sitedir@,$${prefix}/lib/ruby/site_ruby,;t t
diff --git a/configure.in b/configure.in
index d299c633bb..4ed1081720 100644
--- a/configure.in
+++ b/configure.in
@@ -98,6 +98,16 @@ fi
 AC_PROG_CC
 AC_PROG_GCC_TRADITIONAL
 
+echo 'foo(){}' > conftest.c
+if ${CPP} -o conftest.i conftest.c >/dev/null 2>&1; then
+  CPPOUTFILE='-o conftest.i'
+else
+  CPPOUTFILE='> conftest.i'
+fi
+AC_SUBST(CPPOUTFILE)
+OUTFLAG='-o '
+AC_SUBST(OUTFLAG)
+
 AC_PROG_YACC
 AC_CHECK_TOOL(RANLIB, ranlib, :)
 AC_CHECK_TOOL(AR, ar)
diff --git a/djgpp/config.sed b/djgpp/config.sed
index c2f0661913..8c09fc6f1b 100644
--- a/djgpp/config.sed
+++ b/djgpp/config.sed
@@ -65,6 +65,8 @@ s%@arch@%i386-msdosdjgpp%g
 s%@sitedir@%${prefix}/lib/ruby/site_ruby%g
 s%@configure_args@%%g
 s%@MINIRUBY@%./miniruby%
+s%@OUTFLAG@%-o %
+s%@CPPOUTFILE@%-o conftest.i%
 s%@archlib@%/lib/ruby/i386-msdosdjgpp%
 ;s%|| true%%
 ;/\/dev\/null/ {
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index d7f5b5e6f1..a47b0d4e6e 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -13,7 +13,7 @@ SRC_EXT = ["c", "cc", "m", "cxx", "cpp", "C"]
 unless defined? $configure_args
   $configure_args = {}
   args = CONFIG["configure_args"]
-  if /mswin32|bccwin32|mingw/ =~ RUBY_PLATFORM and ENV["CONFIGURE_ARGS"]
+  if ENV["CONFIGURE_ARGS"]
     args << " " << ENV["CONFIGURE_ARGS"]
   end
   for arg in Shellwords::shellwords(args)
@@ -71,7 +71,6 @@ else
   exit 1
 end
 $topdir = $hdrdir
-# $hdrdir.gsub!('/', '\\') if RUBY_PLATFORM =~ /mswin32|bccwin32/
 
 CFLAGS = CONFIG["CFLAGS"]
 if RUBY_PLATFORM == "m68k-human"
@@ -80,21 +79,14 @@ elsif RUBY_PLATFORM =~ /-nextstep|-rhapsody|-darwin/
   CFLAGS.gsub!( /-arch\s\w*/, '' )
 end
 
-if /mswin32/ =~ RUBY_PLATFORM
-  OUTFLAG = '-Fe'
-  CPPOUTFILE = '-P'
-elsif /bccwin32/ =~ RUBY_PLATFORM
-  OUTFLAG = '-o'
-  CPPOUTFILE = '-oconftest.i'
-else
-  OUTFLAG = '-o '
-  CPPOUTFILE = '-o conftest.i'
-end
+OUTFLAG = CONFIG['OUTFLAG']
+CPPOUTFILE = CONFIG['CPPOUTFILE']
 
 $LINK = "#{CONFIG['CC']} #{OUTFLAG}conftest %s -I#{$hdrdir} %s #{CFLAGS} %s #{CONFIG['LDFLAGS']} %s conftest.c %s %s #{CONFIG['LIBS']}"
 $CC = "#{CONFIG['CC']} -c #{CONFIG['CPPFLAGS']} %s -I#{$hdrdir} %s #{CFLAGS} %s %s conftest.c"
 $CPP = "#{CONFIG['CPP']} #{CONFIG['CPPFLAGS']} %s -I#{$hdrdir} %s #{CFLAGS} %s %s %s conftest.c"
 
+
 $INSTALLFILES = nil unless defined? $INSTALLFILES
 
 def rm_f(*files)
@@ -137,6 +129,11 @@ module Logging
     $stdout.reopen(@orgout)
   end
 
+  def self::message(*s)
+    @log ||= File::open(@logfile, 'w')
+    @log.printf(*s)
+  end
+
   def self::logfile file
     @logfile = file
     if @log and not @log.closed?
@@ -168,6 +165,7 @@ def xpopen command, *mode, &block
 end
 
 def try_link0(src, opt="")
+  src = "/* begin */\n#{src}/* end */\n"
   cfile = open("conftest.c", "w")
   cfile.print src
   cfile.close
@@ -183,6 +181,10 @@ def try_link0(src, opt="")
   ensure
     $LDFLAGS = ldflags
     ENV['LIB'] = ORIG_LIBPATH if /mswin32|bccwin32/ =~ RUBY_PLATFORM
+    Logging::message <<"EOM"
+checked program was:
+#{src}
+EOM
   end
 end
 
@@ -198,6 +200,7 @@ def try_link(src, opt="")
 end
 
 def try_compile(src, opt="")
+  src = "/* begin */\n#{src}/* end */\n"
   cfile = open("conftest.c", "w")
   cfile.print src
   cfile.close
@@ -205,10 +208,15 @@ def try_compile(src, opt="")
     xsystem(format($CC, $INCFLAGS, $CPPFLAGS, $CFLAGS, opt))
   ensure
     rm_f "conftest*"
+    Logging::message <<"EOM"
+checked program was:
+#{src}
+EOM
   end
 end
 
 def try_cpp(src, opt="")
+  src = "/* begin */\n#{src}/* end */\n"
   cfile = open("conftest.c", "w")
   cfile.print src
   cfile.close
@@ -216,10 +224,15 @@ def try_cpp(src, opt="")
     xsystem(format($CPP, $INCFLAGS, $CPPFLAGS, $CFLAGS, CPPOUTFILE, opt))
   ensure
     rm_f "conftest*"
+    Logging::message <<"EOM"
+checked program was:
+#{src}
+EOM
   end
 end
 
 def egrep_cpp(pat, src, opt="")
+  src = "/* begin */\n#{src}/* end */\n"
   cfile = open("conftest.c", "w")
   cfile.print src
   cfile.close
@@ -245,15 +258,19 @@ def egrep_cpp(pat, src, opt="")
     end
   ensure
     rm_f "conftest*"
+    Logging::message <<"EOM"
+checked program was:
+#{src}
+EOM
   end
 end
 
 def macro_defined?(macro, src, opt="")
-  try_cpp(src + <<EOP, opt)
+  try_cpp(src + <<SRC, opt)
 #ifndef #{macro}
 # error
 #endif
-EOP
+SRC
 end
 
 def try_run(src, opt="")
@@ -323,13 +340,14 @@ end
 
 def message(*s)
   unless $extmk and not $VERBOSE
-    print(*s)
-    STDOUT.flush
+    printf(*s)
+    $stdout.flush
   end
 end
 
 def have_library(lib, func="main")
   message "checking for #{func}() in -l#{lib}... "
+  Logging::message"checking for #{func}() in -l#{lib}\n"
 
   if func && func != ""
     libs = append_library($libs, lib)
@@ -375,6 +393,7 @@ end
 
 def find_library(lib, func, *paths)
   message "checking for #{func}() in -l#{lib}... "
+  Logging::message"checking for #{func}() in -l#{lib}\n"
 
   libpath = $LIBPATH
   libs = append_library($libs, lib)
@@ -396,6 +415,7 @@ end
 
 def have_func(func, header=nil)
   message "checking for #{func}()... "
+  Logging::message"checking for #{func}()\n"
 
   libs = $libs
   src = 
@@ -434,6 +454,7 @@ end
 
 def have_header(header)
   message "checking for #{header}... "
+  Logging::message"checking for #{header}\n"
 
   unless try_cpp(<<"SRC")
 #include <#{header}>
@@ -448,6 +469,7 @@ end
 
 def have_struct_member(type, member, header=nil)
   message "checking for #{type}.#{member}... "
+  Logging::message "checking for #{type}.#{member}\n"
 
   src = 
     if /mswin32|bccwin32|mingw/ =~ RUBY_PLATFORM
@@ -483,6 +505,7 @@ end
 
 def find_executable(bin, path = nil)
   message "checking for #{bin}... "
+  Logging::message "checking for #{bin}\n"
 
   if path.nil?
     path = ENV['PATH'].split(Config::CONFIG['PATH_SEPARATOR'])
diff --git a/mkconfig.rb b/mkconfig.rb
index 0a0da828c7..b23e6b03cb 100644
--- a/mkconfig.rb
+++ b/mkconfig.rb
@@ -41,7 +41,7 @@ File.foreach "config.status" do |line|
     next if $install_name and /^RUBY_INSTALL_NAME$/ =~ name
     next if $so_name and /^RUBY_SO_NAME$/ =~  name
     v = "  CONFIG[\"" + name + "\"] = " +
-      val.strip.gsub(/\$\{?(\w+)\}?/) {"$(#{$1})"}.dump + "\n"
+      val.gsub(/\$\{?(\w+)\}?/) {"$(#{$1})"}.dump + "\n"
     if fast[name]
       v_fast << v
     else
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index b2ba3187a6..fc0c9c4c65 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -340,6 +340,8 @@ s,@LIBRUBYARG@,$$(RUBY_SO_NAME).lib,;t t
 s,@SOLIBS@,$(SOLIBS),;t t
 s,@DLDLIBS@,$(DLDLIBS),;t t
 s,@ENABLE_SHARED@,yes,;t t
+s,@OUTFLAG@,-Fe,;t t
+s,@CPPOUTFILE@,-P,;t t
 s,@arch@,$(ARCH)-$(OS),;t t
 s,@sitearch@,$(ARCH)-$(RT),;t t
 s,@sitedir@,$${prefix}/lib/ruby/site_ruby,;t t