Log message:
Update to 1.2.41:

version 1.2.41beta01 [September 25, 2009]
  Moved redundant IHDR checking into new png_check_IHDR() in png.c
    and report all errors found in the IHDR data.
  Eliminated useless call to png_check_cHRM() from pngset.c
  Expanded TAB characters in pngrtran.c

version 1.2.41beta02 [September 30, 2009]
  Revised png_check_IHDR().

version 1.2.41beta03 [October 1, 2009]
  Revised png_check_IHDR() again, to check info_ptr members instead of
    the contents of the returned parameters.

version 1.2.41beta04 [October 7, 2009]
  Added "xcode" project similar one already in libpng-1.4.0beta (Alam \ 
Arias).
  Ported some cosmetic changes from libpng-1.4.0beta86.
  Eliminated a shadowed declaration of "pp" in png_handle_sPLT().

version 1.2.41beta05 [October 17, 2009]
  Revised pngconf.h to make it easier to enable iTXt support.  From libpng
    version 1.2.9 through 1.2.40, defining PNG_iTXt_SUPPORTED did not work
    as expected.
  Ported some cosmetic changes from libpng-1.4.0beta87, changing
    many "#if defined(x)" to "#ifdef x".

version 1.2.41beta06 [October 18, 2009]
  Restored PNG_USE_LOCAL_ARRAYS code in pngread.c that was inadvertently
    deleted in libpng-1.2.41beta05.
  Converted all PNG_NO_* tests to PNG_*_SUPPORTED everywhere except pngconf.h
    as in libpng-1.4.0beta78 and later.

version 1.2.41beta07 [October 21, 2009]
  Ported some cosmetic changes from libpng-1.4.0rc01, changing
    many "#if defined(x)" to "#ifdef x" in png.h and pngconf.h.

version 1.2.41beta08 [October 30, 2009]
  Ported from libpng-1.4.0rc01: png_calloc(), png_get_io_chunk_name(),
    png_get_io_state(), png_set_user_cache_max(), png_get_user_cache_max(),
    png_set_premultiply_alpha, and png_do_read_premultiply_alpha().
  Relocated png_do_chop() ahead of building gamma tables in pngrtran.c
    This avoids building 16-bit gamma tables unnecessarily.

version 1.2.41beta09 [November 1, 2009]
  Removed a harmless extra png_set_invert_alpha() from pngwrite.c
  More bugfixes and improvements to CMakeLists.txt (Philip Lowman)
  Moved CMakeLists.txt from scripts into the main libpng directory.
  Apply png_user_chunk_cache_max within png_decompress_chunk().
  Merged libpng-1.2.41.txt with libpng-1.4.0.txt where appropriate.

version 1.2.41beta10 [November 1, 2009]
  Enabled iTXt support by default. To ensure binary compatibility with
    previous versions, the "lang" and "lang_key" members \ 
will be assumed
    to be omitted from previous versions unless the current libpng
    version was built with PNG_iTXt_SUPPORTED (which is otherwise no
    longer necessary to gain iTXt support), as a signal that the user has
    been building previous versions with PNG_iTXt_SUPPORTED as well.

version 1.2.41beta11 [November 2, 2009]
  Store user's user_png_ver in new png_ptr->user_png_ver element.
  Revised iTXt support. To ensure binary compatibility with
    previous versions, the "lang" and "lang_key" members \ 
will be assumed
    to be omitted from versions prior to 1.2.41beta11 whenever there is a
    library mismatch.

version 1.2.41beta12 [November 2, 2009]
  Free png_ptr->user_png_ver when destroying png_ptr.

version 1.2.41beta13 [November 3, 2009]
  Updated scripts/pngw32.def and projects/wince/png32ce.def
  Copied projects/wince/png32ce.def to the scripts directory.
  Added scripts/makefile.wce
  Patched ltmain.sh for wince support.
  Added PNG_CONVERT_tIME_SUPPORTED macro.

version 1.2.41beta14 [November 8, 2009]
  versions 1.2.41beta05 through 1.2.41beta13 were abandoned.
  The 1.0.x/1.2.x series will only receive security updates from now on.
  Make inclusion of time.h in pngconf.h depend on PNG_CONVERT_tIME_SUPPORTED
  Make #define PNG_CONVERT_tIME_SUPPORTED depend on PNG_WRITE_tIME_SUPPORTED
  Reverted iTXt compatibility stuff from 1.2.41beta05, 1.2.41beta11, and
    1.2.41beta12.
  Reverted IOSTATE feature, user_cache_max, and premultiply_alpha features
    from 1.2.41beta08.
  Retained png_calloc() from 1.2.41beta08 but as a non-exported function,
    and removed reference to png_calloc from scripts/*.def

version 1.2.41beta15 [November 8, 2009]
  Added PNG_DEPSTRUCT, PNG_DEPRECATED, PNG_USE_RESULT, PNG_NORETURN, and
    PNG_ALLOCATED macros to detect deprecated direct access to the
    png_struct or info_struct members and other deprecated usage in
    applications (John Bowler).
  Updated scripts/makefile* to add "-DPNG_CONFIGURE_LIBPNG" to CFLAGS,
    to prevent warnings about direct access to png structs by libpng
    functions while building libpng.  They need to be tested, especially
    those using compilers other than gcc.
  Updated projects/visualc6 and visualc71 with "/d PNG_CONFIGURE_LIBPNG".

version 1.2.41beta16 [November 9, 2009]
  Removed three direct references to read_info_ptr members in pngtest.c
    that were detected by the new PNG_DEPSTRUCT macro.
  Only #define PNG_DEPSTRUCT, etc. in pngconf.h if not already defined.

version 1.2.41beta17 [November 10, 2009]
  Updated CMakeLists.txt to add "-DPNG_CONFIGURE_LIBPNG" to the \ 
definitions.
  Marked deprecated function prototypes with PNG_DEPRECATED.
  Marked memory allocation function prototypes with PNG_ALLOCATED.
  Changed png_check_sig() to !png_sig_cmp() in contrib programs.
  Corrected the png_get_IHDR() call in contrib/gregbook/readpng2.c
  Added "-DPNG_CONFIGURE_LIBPNG" to the contrib/pngminum makefiles.

version 1.2.41beta18 [November 11, 2009]
  Renamed scripts/makefile.wce to scripts/makefile.cegcc
  Marked nonexported functions with PNG_PRIVATE macro.

version 1.2.41rc01 and 1.0.51rc01 [November 18, 2009]
  Revised scripts/*.def to reflect functions actually exported by libpng.
  Updated the copyright year in scripts/pngw32.rc from 2004 to 2009.
  Moved descriptions of makefiles and other scripts out of INSTALL into
    scripts/README.txt

version 1.2.41rc02 [November 22, 2009]
  Rebuilt the configure scripts with autoconf-2.65

version 1.2.41rc03 [November 25, 2009]
  Disabled the new pedantic warnings about deprecated function use
    and deprecated structure access unless the user defines
    PNG_PEDANTIC_WARNINGS.
  Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
  Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.

version 1.2.41 [December 3, 2009]
  Updated the list of files and made some cosmetic changes in README.

Log message:
Update to 1.2.40:

version 1.2.40beta01 [August 20, 2009]
  Removed an extra png_debug() recently added to png_write_find_filter().
  Fixed incorrect #ifdef in pngset.c regarding unknown chunk support.

version 1.2.40rc01 [September 2, 2009]
  Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)

version 1.2.40 and 1.0.49 [September 10, 2009]
  No changes.

Log message:
Use .tar.bz2 again, 112kb bigger (gz is 280kb bigger).

Log message:
Update to 1.2.39. Use .xz instead of .gz. (20% smaller)

version 1.2.39beta01 [July 25, 2009]
  Added a prototype for png_64bit_product() in png.c

version 1.2.39beta02 [July 27, 2009]
  Avoid a possible NULL dereference in debug build, in png_set_text_2().
    (bug introduced in libpng-0.95, discovered by Evan Rouault)

version 1.2.39beta03 [July 29, 2009]
  Relocated new png_64_bit_product() prototype into png.h
  Expanded the information about prototypes in the libpng style section of
    the documentation.
  Rebuilt configure scripts with autoconf-2.64.

version 1.2.39beta04 [August 1, 2009]
  Replaced *.tar.lzma with *.txz in distribution.  Get the xz codec
    from <http://tukaani.org/xz>.

version 1.2.39beta05 [August 1, 2009]
  Reject attempt to write iCCP chunk with negative embedded profile length
    (JD Chen)

version 1.2.39c01 [August 6, 2009]
  No changes.

version 1.2.39 and 1.0.48 [August 13, 2009]
  No changes.

Log message:
Make sure "pkg-config --libs libpng" emits a run path.
Bump revision.

Log message:
Update to 1.2.38:

version 1.2.38beta01 [June 17, 2009]
  Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
    multiple times and to specify the sample order in the tRNS chunk,
    because the ISO PNG specification has a typo in the tRNS table.
  Changed several PNG_UNKNOWN_CHUNK_SUPPORTED to
    PNG_HANDLE_AS_UNKNOWN_SUPPORTED, to make the png_set_keep mechanism
    available for ignoring known chunks even when not saving unknown chunks.
  Adopted preference for consistent use of "#ifdef" and \ 
"#ifndef" versus
    "#if defined()" and "if !defined()" where possible.
  Added PNG_NO_HANDLE_AS_UNKNOWN in the PNG_LEGACY_SUPPORTED block of
    pngconf.h, and moved the various unknown chunk macro definitions
    outside of the PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.

version 1.2.38rc01 [June 24, 2009]
  No changes.

version 1.2.38rc02 [June 29, 2009]
  Added a reference to the libpng license in each source file.

version 1.2.38rc03 [July 11, 2009]
  Revised references to the libpng license in pngconf.h and contrib/visupng
    source files.
  Rebuilt configure scripts with autoconf-2.63.

version 1.0.47 and 1.2.38 [July 16, 2009]
  No changes.

Log message:
Remove @dirrm entries from PLISTs

Log message:
Update to 1.2.37:

version 1.2.37beta01 [May 14, 2009]
  Fixed inconsistency in pngrutil.c, introduced in libpng-1.2.36.  The
    memset() was using "png_ptr->rowbytes" instead of \ 
"row_bytes", which
    the corresponding png_malloc() uses (Joe Drew).
  Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)
  Updated some of the makefiles in the scripts directory (merged with
    those in libpng-1.4.0beta57).

version 1.2.37beta02 [May 19, 2009]
  Fixed typo in libpng documentation (FILTER_AVE should be FILTER_AVG)
  Relocated misplaced #endif in pngwrite.c, sCAL chunk handler.
  Conditionally compile png_read_finish_row() which is not used by
    progressive readers.
  Added contrib/pngminim/preader to demonstrate building minimal progressive
    decoder, based on contrib/gregbook with embedded libpng and zlib.

version 1.2.37beta03 [May 20, 2009]
  In contrib/pngminim/*, renamed "makefile.std" to \ 
"makefile", since there
    is only one makefile in those directories, and revised the README files
    accordingly.
  Reformated sources in libpng style (3-space indentation, comment format)

version 1.2.37rc01 [May 27, 2009]
  No changes.

versions 1.2.37 and 1.0.45 [June 4, 2009]
  Reformatted several remaining "else statement;" and "if () \ 
statment;" into
    two lines.
  Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
    and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
  Added sections about the git repository and our coding style to the
    documentation (merged from libpng-1.4.0beta62)
  Added a section about using png_get_io_ptr() in configure scripts to detect
    the presence of libpng.

Log message:
Update to 1.2.36:

version 1.2.36beta01 [February 28, 2009]
  Revised comments in png_set_read_fn() and png_set_write_fn().
  Revised order of #ifdef's and indentation in png_debug definitions of png.h
    bug introduced in libpng-1.2.34.

version 1.2.36beta02 [March 21, 2009]
  Use png_memset() after png_malloc() of big_row_buf when reading an
    interlaced file, to avoid a possible UMR.
  Undid recent revision of PNG_NO_STDIO version of png_write_flush().  Users
    having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined.
  Revised libpng*.txt documentation about use of png_write_flush().
  Removed fflush() from pngtest.c.
  Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h

version 1.2.36beta03 [March 27, 2009]
  Relocated misplaced PNG_1_0_X define in png.h that caused the prototype
    for png_set_strip_error_numbers() to be omitted from PNG_NO_ASSEMBLER_CODE
    builds.  This bug was introduced in libpng-1.2.15beta4.
  Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt

version 1.2.36beta04 [April 5, 2009]
  Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph \ 
Giles)

version 1.2.36beta05 [April 24, 2009]
  Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow
    application code writers to bypass the check for multiple inclusion
    of setjmp.h when they know that it is safe to ignore the situation.
  Made some cosmetic changes to whitespace in pngtest output.
  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 1.2.36rc01 [April 30, 2009]
  No changes.

version 1.0.44 and 1.2.36 [May 7, 2009]
  No changes.

Log message:
Simply and speed up buildlink3.mk files and processing.
This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.