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..., libtiff all installed cairo-current-win.tar.gz The only other change I made was to set EOPTS=-march=corei7 as the GCC included in the toolchain in 4.6.3 which recognizes the i7 (as opposed to Cygwin which is using 4.5.3 and only recognizes the core2). My computer is a Lenovo W520 with a Core i7 2760QM running Windows XP Professional. If there is any other information that would be helpful in uncovering why this is happening, please let me know. Thank you very much, Avraham Adler PS: Copying the compiled Rblas.dll over to my regular R install (binary from the CRAN) seems to work just fine an...