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-rw-r--r--etc/PROBLEMS30
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diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index f09dc2c6cb9..81536e26242 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -62,6 +62,36 @@ are various enhancements at <URL:ftp://dlpx1.dl.ac.uk/fx/emacs/Mule>
which improve Emacs 21's handling of non-ASCII text, including dealing
with CJK Unicode.
+** Mule-UCS compilation problem.
+
+Emacs of old versions and XEmacs byte-compile the form `(progn progn
+...)' the same way as `(progn ...)', but Emacs of version 21.3 and the
+later process that form just as interpreter does, that is, as `progn'
+variable reference. Apply the following patch to Mule-UCS 0.84 to
+make it compiled by the latest Emacs.
+
+--- mucs-ccl.el 2 Sep 2005 00:42:23 -0000 1.1.1.1
++++ mucs-ccl.el 2 Sep 2005 01:31:51 -0000 1.3
+@@ -639,10 +639,14 @@
+ (mucs-notify-embedment 'mucs-ccl-required name)
+ (setq ccl-pgm-list (cdr ccl-pgm-list)))
+ ; (message "MCCLREGFIN:%S" result)
+- `(progn
+- (setq mucs-ccl-facility-alist
+- (quote ,mucs-ccl-facility-alist))
+- ,@result)))
++ ;; The only way the function is used in this package is included
++ ;; in `mucs-package-definition-end-hook' value, where it must
++ ;; return (possibly empty) *list* of forms. Do this. Do not rely
++ ;; on byte compiler to remove extra `progn's in `(progn ...)'
++ ;; form.
++ `((setq mucs-ccl-facility-alist
++ (quote ,mucs-ccl-facility-alist))
++ ,@result)))
+
+ ;;; Add hook for embedding translation informations to a package.
+ (add-hook 'mucs-package-definition-end-hook
+
* Building Emacs with GCC 2.9x fails in the `src' directory.
This may happen if you use a development version of GNU `cpp' from one