build from source, patch does not remove cleanly

[T o n g <mlist4suntong@yahoo.com>]

Hi,

I'm trying to build uswsusp from source. It builds fine with

 debuild -us -uc

provided that I don't change anything. But having made my modification, I 
got the following error:

----------------------------------------------------------
[...]
debconf-updatepo
dh_clean 
QUILT_PATCHES=debian/patches quilt --quiltrc /dev/null pop -a -R || test 
$? = 2 
Removing patch compress_ratio.patch
Restoring suspend.c

Patch whitelist.patch does not remove cleanly (refresh it or enforce with 
-f)
make: *** [unpatch] Error 1
dpkg-buildpackage: error: fakeroot debian/rules clean gave error exit 
status 2
debuild: fatal error at line 1330:
dpkg-buildpackage -rfakeroot -D -us -uc failed
----------------------------------------------------------

How should I fix it? 

thanks

-- 
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