ops, the patch is on-the-fly modified. Sorry, I overlooked this fact.

jabberd/jabberd.patch

@@ -6,7 +6,7 @@ Index: configure
  
  if test "x-$enable_mysql" = "x-yes" ; then
 -        for i in /usr /usr/local /usr/local/mysql ; do
-+        for i in /openpkg-dev ; do
++        for i in @l_prefix@; do
                  for j in include include/mysql "" ; do
                          if test -r "$i/$j/mysql.h" ; then
                                  MYSQL_INCLUDE=$i/$j