anchor.diff:    meta = with stdenv.lib; {
       description = "A vector and matrix math library implemented using C++ templates";
   
  -    longDescription = ''vmmlib is a vector and matrix math library implemented 
  -            using C++ templates. Its basic functionality includes a vector 
  -            and a matrix class, with additional functionality for the 
  +    longDescription = ''vmmlib is a vector and matrix math library implemented
  +            using C++ templates. Its basic functionality includes a vector
  +            and a matrix class, with additional functionality for the
               often-used 3d and 4d vectors and 3x3 and 4x4 matrices.
  -            More advanced functionality include solvers, frustum 
  +            More advanced functionality include solvers, frustum
               computations and frustum culling classes, and spatial data structures'';
   
       license     = licenses.bsd2;
  
positive.code:   ];
  
    nativeBuildInputs = [ pkgconfig cmake ];
    buildInputs = [ boost blas ]
      ++ stdenv.lib.optionals stdenv.isDarwin [ Accelerate CoreGraphics CoreVideo ];
  
    enableParallelBuilding = true;
  
negative.code: { stdenv, fetchFromGitHub, cmake, pkgconfig, boost, lapack
  , Accelerate, CoreGraphics, CoreVideo
  }:
  
  