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IMPORTANT: Tested only with
           libpng ver. 1.0.{5,6,8,9,10,12}, 1.2.{0,1,2,3,4,5,6,7,8}
           jpeg ver. 6b
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Instructions for building Rbitmap.dll are in the R Installation and
Administration manual, R-admin.{pdf|html|texi}.
