Detailed Windows build instructions, using MinGW (64-bit):
   Install MinGW and the MSYS Developer Tool Kit (http://www.mingw.org/)
      * Choose C, C++ and MSys on install and select to have it update its libraries
      * Install into C:\MinGW
      * Add C:\MinGW\bin and c:\MinGW\msys\1.0 to your path
   Download MinGW64 from http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Automated%20Builds/
      * Choose mingw-w64-bin_i686-mingw_20111220.zip
      * Extract ZIP to C:\MinGW64
      * Add C:\MinGW64\bin to your path before C:\MinGW\bin
   Install libcurl devel (http://curl.haxx.se/download.html)
      * download curl-7.30.0.tar.gz from http://curl.haxx.se/download.html and put it in C:\deps\
      * launch an MSYS shell and enter the following commands (the configure step will take a long time!)
         cd /c/deps
         tar -xvzf curl-7.30.0.tar.gz
         cd curl-7.30.0
         ./configure --host=x86_64-w64-mingw32 –-prefix=/c/mingw64
         make
         make install
         cp /c/deps/curl-7.30.0/docs/libcurl/libcurl.m4 /c/mingw/share/aclocal/libcurl.m4
   Install pthreads
      * download pthreads-20100604.zip from http://sourceforge.net/projects/mingw-w64/files/External%20binary%20packages%20%28Win64%20hosted%29/pthreads/ and put it in C:\deps\
      * unzip the file to c:\deps\
      * In the mingw64 subdirectory is pthreads-w64.zip - extract the contents to C:\MinGW64
   In the MSYS shell, navigate to the CPUminer source code direcctory
      * You will likely get higher hashrates by forcing the compiler to build the executable for your
        specific CPU architecture.  This is done by adding "-march=" into the CFLAGS.  Those
        values can be found at http://gcc.gnu.org/onlinedocs/gcc/i386-and-x86_002d64-Options.html
           common choices for intel are : core2, corei7, corei7-avx
           common choices for AMD are : athlon-fx
      * Execute the following (replacing the value of -march with the value for your CPU type)
         ./autogen.sh
         ./configure --host=x86_64-w64-mingw32 CFLAGS="-O3 -march=core2 -DCPU_X86_FORCE_INTRINSICS"
         make
   Strip minerd.exe
      * In a command prompt, in the compilation directory, execute the following
         x86_64-w64-mingw32-strip minerd.exe
   Combine the executables with the dependencies
      * copy minerd.exe, C:\MinGW64\bin\libcurl-4.dll, and C:\MinGW64\bin\pthreadGC2-w64.dll to the same directory