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Version 1.4.0beta56 [April 25, 2009]
  Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress
    "shadowed declaration" warning from gcc-4.3.3.
  Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration"
    warning about a global "gamma" variable in math.h on some platforms.

Version 1.4.0beta57 [May 2, 2009]
  Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
    but was never defined (again).
  Rebuilt configure scripts with autoconf-2.63 instead of 2.62
  Removed pngprefs.h and MMX from makefiles

Version 1.4.0beta58 [May 14, 2009]
  Changed pngw32.def to pngwin.def in makefile.mingw (typo was introduced
    in beta57).
  Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)

Version 1.4.0beta59 [May 15, 2009]
  Reformated sources in libpng style (3-space intentation, comment format)
  Fixed typo in libpng docs (PNG_FILTER_AVE should be PNG_FILTER_AVG)
  Added sections about the git repository and our coding style to the