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Libpng 1.6.13 - August 21, 2014

This is a public release of libpng, intended for use in production codes.

Files available for download:

Source files with LF line endings (for Unix/Linux) and with a
"configure" script

   libpng-1.6.13.tar.xz (LZMA-compressed, recommended)
   libpng-1.6.13.tar.gz

Source files with CRLF line endings (for Windows), without the
"configure" script

   lpng1613.7z  (LZMA-compressed, recommended)
   lpng1613.zip

Other information:

   libpng-1.6.13-README.txt
   libpng-1.6.13-LICENSE.txt
   libpng-1.6.13-*.asc (armored detached GPG signatures)

Changes since the last public release (1.6.12):

  Quieted -Wsign-compare and -Wclobber compiler warnings in
    contrib/pngminus/*.c
  Added "(void) png_ptr;" where needed in contrib/gregbook to quiet
    compiler complaints about unused pointers.
  Split a long output string in contrib/gregbook/rpng2-x.c.
  Added "PNG_SET_OPTION" requirement for sRGB chunk support to pnglibconf.dfa,
    Needed for write-only support (John Bowler).
  Changed "if defined(__ARM_NEON__)" to
    "if (defined(__ARM_NEON__) || defined(__ARM_NEON))" (James Wu).
  Fixed clang no-warning builds: png_digit was defined but never used.
  Fixed an incorrect separator ("/" should be "\") in scripts/makefile.vcwin32
    (bug report from Wolfgang S. Kechel).  Bug was introduced in libpng-1.6.11.
    Also fixed makefile.bc32, makefile.bor, makefile.msc, makefile.intel, and
    makefile.tc3 similarly.
  Removed scripts/makefile.elf. It has not worked since libpng-1.5.0beta14
    due to elimination of the PNG_FUNCTION_EXPORT and PNG_DATA_EXPORT
    definitions from pngconf.h.
  Ensure that CMakeLists.txt makes the target "lib" directory before making
    symbolic link into it (SourceForge bug report #226 by Rolf Timmermans).
  Added opinion that the ECCN (Export Control Classification Number) for
    libpng is EAR99 to the README file.
  Eliminated use of "$<" in makefile explicit rules, when copying
    $PNGLIBCONF_H_PREBUILT.  This does not work on some versions of make;
    bug introduced in libpng version 1.6.11.
  Made "ccopts" agree with "CFLAGS" in scripts/makefile.hp* and makefile.*sunu

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