Prerequisites:

• GNUStep msys
• GNUStep core
• GNUStep devel
• win-builds

Installing the Software:

• Install GNUStep msys, core and devel in this order

• Run the win-builds installer and select Cygwin or MSYS and x86_64, add the http mirror as shown in the example (http://win-builds.org/1.5.0) and select C:\GNUStep as install dir
  Note: for myself the download from within win-builds installer failed and i had to resort to this documentation on how to download the packages with wget and use the downloaded folder as http mirror

• Install all packages in win-builds by clicking Proccess

• Execute the msys.bat in C:\GNUStep\msys\1.0

• Be sure to extend your PATH variable to include /c/GNUstep/msys/1.0/opt/windows_64/bin/ from within your msys shell.
  To do so either execute PATH="/c/GNUstep/msys/1.0/opt/windows_64/bin/:$PATH"
  or create a bash script with this command so you can easily update your PATH

• now just change to C:\GNUStep\msys\1.0\home\<USERNAME>\<cpuminer-opt-src> and execute the buildscript