Using Cygwin to compile on Windows 64-bit OS

I am trying to compile MPFR using GCC and Cygwin. When I set CFLAGS=-m64, I get an error stating "c compiler cannot create executables"

I am on Windows 7 (64-bit)

Why would I get this error?
neelytdAsked:
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jkrCommented:
You might not like that, but it seems that '-m64' is unsupported on Cygwin, see http://cygwin.com/ml/cygwin/2007-10/msg00622.html
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gheistCommented:
Why not visual studio C compiler with MinGW make?
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