change INSTALL to README and update

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+updated for Linux on 2012-09-12
+
+
+get the source version through svn :
+
+svn co https://pure-data.svn.sourceforge.net/svnroot/pure-data pure-data
+cd pure-data/trunk/externals/pix_opencv
+
+===== GNU/Linux ===== 
+
+(actually only tested in GNU/Linux Ubuntu)
+this new version requiered OpenCV 2.3, available with apt-get since 12.04 :
+
+apt-get install libopencv-dev libcv-dev libhighgui-dev
+
+for other systems, you must build the lib from source, see this :
+http://opencv.willowgarage.com/wiki/InstallGuide
+
+get the _SOURCES_ of the pd you are using
+and of the GEM that you are loading
+( it might not work if the version
+is different )
+
+cd into the package folder :
+
+  cd pix_opencv
+
+configure the package with the appropriate command for your system :
+
+  ./configure --with-pd=<path to pd _sources_> --with-gem=<path to gem _sources_>
+
+for example :
+
+./configure --with-pd=/usr/local/pd --with-gem=/usr/local/pd/gem
+
+then, compile it :
+
+make clean
+make
+
+and put the *.pd_linux and *.pd files somewhere in Pd's path.  You can add the
+current directory to the pd search path through Media->Preferences->Path
+
+
+===== MAC OSX (intel and powerPC) =====
+
+
+first install openCV MacOS framework 
+   download openCV private framework from http://www.ient.rwth-aachen.de/cms/software/opencv/
+   copy the provided OpenCV.framework folder in your /Library/Frameworks/ directory ::
+	cp -Rf /Volumes/OpenCV\ Private\ Framework/OpenCV.framework /Library/Frameworks/
+ 
+get the _SOURCES_ of the pd you are using
+and of the GEM that you are loading
+( it might not work if the version
+is different )
+
+cd into the package folder ::
+
+  cd pix_opencv
+
+configure the package with the appropriate command for your system :
+
+  ./configure --with-pd=<path to pd _sources_> --with-gem=<path to gem _sources_>
+
+for example :
+
+./configure --with-pd=/usr/local/pd --with-gem=/usr/local/pd/gem
+
+then, compile it ::
+
+  make clean
+  make
+
+and copy the .pd_darwin to your externals folder ::
+
+  cp *.pd_darwin /Applications/Pd-0.40.3-extended-20080315.app/Contents/Resources/extra/Gem/ for example
+