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User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)

Description of problem:
Compiling xmms from sources I received strange error message just after 
configuration stage:

#make
cd . && autoheader
WARNING: Using auxiliary files such as `acconfig.h', `config.h.bot'
WARNING: and `config.h.top', to define templates for `config.h.in'
WARNING: is deprecated and discouraged.

WARNING: Using the third argument of `AC_DEFINE' and
WARNING: `AC_DEFINE_UNQUOTED' allows to define a template without
WARNING: `acconfig.h':

WARNING:   AC_DEFINE([NEED_MAIN], 1,
WARNING:             [Define if a function `main' is needed.])

WARNING: More sophisticated templates can also be produced, see the
WARNING: documentation.
Malformed UTF-8 character (unexpected continuation byte 0xa0, with no preceding 
start byte) at /users/compiler/tmp/ahYkkldA/traces
.pl line 350.
autoheader: `config.h.in' is updated
cd . \
  && CONFIG_FILES= CONFIG_HEADERS=config.h \
     /bin/sh ./config.status
creating config.h
make  all-recursive

As a result config.h contain unprintable symbol which may cause compilation 
error for some compilers. 
I found that mailformed UTF-8 character comes from configure.in : line 592 
(AC_DEFINE(DISABLE_USER_PLUGIN_DIR,,.[Define to disable per user plugin 
directory])). Probably you typed it occasionally; it should be removed to 
increase Red Hat Linux portablity.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. build binaries from source rpms.
2.
3.
	

Actual Results:  autoheader emits warning.
If you use compiler that doesn't ignore mailformed symbols you will get 
compilation error.

Expected Results:  Smoothly built package.

Additional info:

I'll attach the patch which removes mailformed symbol from configure.in.