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==============================================IMPORTANT: Tested only with zlib ver. 1.1.3,libpng ver. 1.0.{5,6,8,9,10},jpeg ver. 6b==============================================1) You need libpng, zlib and jpeg sources (available, e.g., fromftp.uu.net/graphics/[png,jpeg].2) Their sources must be unpacked in sub-directories of this dir.zlib and libpng sources must be in sub-dirs named 'zlib' and'libpng' (these fixed names are required by libpng documentation).Example:> unzip -d zlib zlib113.zip> tar xzvf libpng-1.0.10.tar.gz> mv libpng-1.0.10 libpng> tar xzvf jpegsrc.v6b.tar.gzIf jpeg version is different from 6b, edit 'Makefile' and changethe definition of JPEGDIR.3) Then,> makeshould build Rbitmap.dll and install it in R_HOME/bin.