OpenCL, download headers and libraries from www.khronos.org
OpenGL Mathematics, download headers from www.g-truc.net
libpng, download headers and source from www.libpng.org/pub/png/libpng.html
The library file needs to be built from the downloaded source.
zlib, libpng needs zlib to compile, read instructions in the libpng documentation.
Cloo is a NuGet package and should be downloaded automatically when you compile for the first time.