Hi Florian Echtler.
Your workaround not working for me.
Ubuntu 10.10 32bit
Linux wings 2.6.35-23-generic-pae #41-Ubuntu SMP Wed Nov 24 10:35:46 UTC 2010 
i686 GNU/Linux

I installed packets:
sudo apt-get install devscripts quilt  quilt libraw1394-dev libdc1394-22-dev 
liblapack-dev python-dev swig texlive-fonts-extra texlive-latex-extra 
texlive-latex-recommended latex-xcolor texlive-fonts-recommended

Download sources:
apt-get source opencv

Removal patch "fix_3rdparty_build.patch" leads to an error, so I
replaced it with an empty file.

debuild configured - OK.(attached)

debuild make output error:

Building CXX object 
src/cxcore/CMakeFiles/cxcore_pch_dephelp.dir/cxcore_pch_dephelp.o
cd /home/dis/opencv-2.1.0/obj-i686-linux-gnu/src/cxcore && /usr/bin/c++   
-DHAVE_IPP -DHAVE_CONFIG_H -DCVAPI_EXPORTS -g -O2   -Wall -pthread -march=i686 
-ffunction-sections  -O3 -DNDEBUG  -fomit-frame-pointer -ffast-math 
-mfpmath=387 -DNDEBUG  -I/usr/lib/python2.6/dist-packages/numpy/core/include 
-I/usr/lib/../include -I/home/dis/opencv-2.1.0/. 
-I/home/dis/opencv-2.1.0/obj-i686-linux-gnu -I/home/dis/opencv-2.1.0/include 
-I/home/dis/opencv-2.1.0/include/opencv 
-I/home/dis/opencv-2.1.0/src/cxcore/../../3rdparty/include 
-I/home/dis/opencv-2.1.0/src/cxcore/../../include/opencv 
-I/home/dis/opencv-2.1.0/obj-i686-linux-gnu/src/cxcore   -D PYTHON_USE_NUMPY=1 
-o CMakeFiles/cxcore_pch_dephelp.dir/cxcore_pch_dephelp.o -c 
/home/dis/opencv-2.1.0/obj-i686-linux-gnu/src/cxcore/cxcore_pch_dephelp.cxx
In file included from /home/dis/opencv-2.1.0/src/cxcore/_cxcore.h:63,
                 from 
/home/dis/opencv-2.1.0/obj-i686-linux-gnu/src/cxcore/cxcore_pch_dephelp.cxx:1:
/home/dis/opencv-2.1.0/include/opencv/cvinternal.h:99: fatal error: ipp.h: File 
not found.

How do you solved this problem?

** Attachment added: "debuild_config"
   
https://bugs.launchpad.net/ubuntu/+source/opencv/+bug/684302/+attachment/1767266/+files/debuild_config

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https://bugs.launchpad.net/bugs/684302

Title:
  cvInvert may cause segmentation fault

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