Notes on MinGW64 gcc 4.5.2 install (6-28-11)
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Package is mingw-w64-bin_x86_64-mingw_4.5.2_20110222_multilib_megasoft78.7z
    from http://sourceforge.net/projects/mingw-w64/.

1. Decompressed package
2. Re-named root folder "mingw".
3. Removed these folders:
   a. mingw\mingw
   b. mingw\lib64
   c. mingw\include
   d. mingw\x86_64-w64-mingw32\lib
4. Added RSXNT's make.exe, which I prefer (and supporting rsxnt.dll) to d:\mingw\bin.
5. Put d:\mingw\bin in path.
6. set c_include_path=d:\mingw\x86_64-w64-mingw32\include
7. set cplus_include_path=d:\mingw\x86_64-w64-mingw32\include
8. set library_path=d:\mingw\x86_64-w64-mingw32\lib[64|32]
   (Does ld really use this env var?)
9. Use -m64 cflag for 64-bit, -m32 for 32-bit.