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IMPORTANT: Tested only with
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           libpng ver. 1.0.{5,6,8,9,10,12}, 1.2.{0,1,2,3,4,5}
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           jpeg ver. 6b
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==============================================
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1) You need libpng and jpeg sources (available, e.g., from
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   www.libpng.org, ftp.uu.net/graphics/[png,jpeg].
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2) Their sources must be unpacked in sub-directories of this dir.
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   The libpng sources must be in sub-dir named 'libpng' (as required
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   by the libpng documentation).
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   Example:
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   > mv libpng-1.2.5 libpng
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   > tar xzvf jpegsrc.v6b.tar.gz
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   If jpeg version is different from 6b, edit 'Makefile' and change
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   the definition of JPEGDIR.
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3) Then,
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   > make
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   should build  Rbitmap.dll and install it in R_HOME/bin.