How to build OpenTK: 1) Install nant from (http://nant.sourceforge.net/) 2) Navigate to the Build folder and execute Build.exe: 2a) Under Linux/Mac OS X, type 'mono Build.exe mono' or 'mono Build.exe mono debug' for the release/debug versions of the library. 2b) Under Windows type 'build net' (or 'build net debug'). 3) The binaries (library, examples) are placed in the Binaries/Release or Binaries/Debug folder. There are other parameters you can pass to Build.exe. A brief list: net - build using the .Net framework. mono - build using Mono. debug - build the debug version (e.g. 'build net debug'). clean - delete intermediate object files and projects (reclaim some space, the binaries are not touched). distclean - delete intermediate and final object files (reclaim all space used during compilation). vs2005 (vs) - create project files for Visual Studio 2005. monodev (md) - create project files for MonoDevelop. sharpdev (sd) - as above, for SharpDevelop. sharpdev2 (sd2) - as above, for SharpDevelop2.