Merge pull request #7 from cmacdonald/patch-3

README.windows.md

Author: isoboroff

README.windows.md

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+## Compiling
+
+To achieve a compilation of trec_eval for Windows, you will need Cygwin installed.
+
+Download and install the [Cygwin](https://www.cygwin.com/) platform. You will need make and gcc installed by Cygwin. To achieve this, on top of the default Cygwin installation, it is recommended to install automake, make, gcc, cygwin-gcc and git from the Develop category, and permitting dependencies to be installed.
+
+Then, to compile trec_eval, open a Cygwin Terminal, navigate using cd to the directory of the trec_eval source, and type make.
+
+## Running
+
+The resulting trec_eval.exe should be usable directly from the Cygwin Terminal.
+
+The resulting trec_eval.exe should be usable on any machine without Cygwin installed, as long as the cygwin1.dll is available. For instance, place a copy the cygwin1.dll from Cygwin's /bin directory into the same directory as trec_eval.exe.