update.

[elisp/flim.git] / mel.el

diff --git a/mel.el b/mel.el
index ccfc072..c8764a9 100644 (file)
--- a/mel.el
+++ b/mel.el
@@ -96,8 +96,11 @@ Content-Transfer-Encoding for it."
 
 (mel-define-backend "binary" ("8bit"))
 
-(when (and (fboundp 'base64-encode-string)
-          (subrp (symbol-function 'base64-encode-string)))
+(defvar mel-b-builtin
+   (and (fboundp 'base64-encode-string)
+        (subrp (symbol-function 'base64-encode-string))))
+
+(when mel-b-builtin
   (mel-define-backend "base64")
   (mel-define-method-function (mime-encode-string string (nil "base64"))
                              'base64-encode-string)