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  Unlike C codes generated automatically by f2c (Fortran 77 into C converter),
  this port includes changes based on my interpretations, improvements,
  optimizations, and clean-ups so that the ported code would be well-suited
  for a C code. In addition to comments inherited from the original code,
  a number of comments were added through my interpretations.
- <b>Callback interface</b>:
  The library receives function and gradient values via a callback interface.
  The library also notifies the progress of the optimization by invoking a
  callback function. In the original implementation, a user had to set
  function and gradient values every time the function returns for obtaining
  updated values.
- <b>Thread safe</b>:
  The library is thread-safe, which is the secondary gain from the callback
  interface.
- <b>Cross platform.</b> The source code can be compiled on Microsoft Visual
  Studio 2005, GNU C Compiler (gcc), etc.
- <b>Configurable precision</b>: A user can choose single-precision (float)
  or double-precision (double) accuracy by changing ::LBFGS_FLOAT macro.
- <b>SSE/SSE2 optimization</b>:
  This library includes SSE/SSE2 optimization (written in compiler intrinsics)
  for vector arithmetic operations on Intel/AMD processors. The library uses