diff --git a/ChangeLog b/ChangeLog
index be7090ca42..54f60a91c3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Oct 31 15:09:28 2001  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* eval.c (POP_VARS): should not set DVAR_DONT_RECYCLE if _old
+	  ruby_vars is already force_recycled.
+
 Wed Oct 31 02:44:06 2001  Wakou Aoyama  <wakou@fsinet.or.jp>
 
 	* lib/cgi.rb: CGI::Cookie::parse(): Ignore duplicate keys caused by
diff --git a/config.sub b/config.sub
index 0387ee530f..a2d8b0d596 100644
--- a/config.sub
+++ b/config.sub
@@ -117,7 +117,7 @@ esac
 # Here we must recognize all the valid KERNEL-OS combinations.
 maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
 case $maybe_os in
-  nto-qnx* | linux-gnu* | storm-chaos* | os2-emx*)
+  nto-qnx* | linux-gnu* | linux-libc1 | storm-chaos* | os2-emx*)
     os=-$maybe_os
     basic_machine=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`
     ;;
diff --git a/eval.c b/eval.c
index a006f3444d..aa56085e9a 100644
--- a/eval.c
+++ b/eval.c
@@ -593,7 +593,8 @@ struct RVarmap *ruby_dyna_vars;
 
 #define POP_VARS()			\
    if (_old && (ruby_scope->flag & SCOPE_DONT_RECYCLE)) \
-       FL_SET(_old, DVAR_DONT_RECYCLE); \
+       if (RBASIC(_old)->flags) /* unless it's already recycled */ \
+           FL_SET(_old, DVAR_DONT_RECYCLE); \
     ruby_dyna_vars = _old;		\
 }
 
diff --git a/version.h b/version.h
index e5240810b1..7501e0b68f 100644
--- a/version.h
+++ b/version.h
@@ -1,4 +1,4 @@
 #define RUBY_VERSION "1.6.5"
-#define RUBY_RELEASE_DATE "2001-10-30"
+#define RUBY_RELEASE_DATE "2001-10-31"
 #define RUBY_VERSION_CODE 165
-#define RUBY_RELEASE_CODE 20011030
+#define RUBY_RELEASE_CODE 20011031