For inflate, reverted previous fixes.
Added fixitxt and pngdeflate to the built programs and removed warnings
from the source code and timepng that are revealed as a result.  Fixed
fixitxt when the chunk length is more than 65535 (untested, no test case).

Revised scripts/makefile.freebsd to respect ZLIBDIR and ZLIBINC.

directory while building with a parallel make.

internal 'prefix.h' file can only be generated correctly after
pnglibconf.h, however the dependency was not in Makefile.am.  The
symptoms are unpredictable depending on the order make chooses to
build pngprefix.h and pnglibconf.h, often the error goes unnoticed
because there is a system pnglibconf.h to use instead.

code to the hardware subdirectory and added comments to pngrutil.c so that
implementors of other optimizations know what to do.

Added information about the new limits in the manual.

    FLOATING_POINT options were switched off, png.h ended up with lone ';'
    characters.  This is not valid ANSI-C outside a function.  The ';'
    characters have been moved inside the definition of PNG_FP_EXPORT and
    PNG_FIXED_EXPORT. 2) If either option was switched off, the declaration
    of the corresponding functions were completely omitted, even though some
    of them are still used internally.  The result is still valid, but
    produces warnings from gcc with some warning options (including -Wall). The
    fix is to cause png.h to declare the functions with PNG_INTERNAL_FUNCTION
    when png.h is included from pngpriv.h.

Renamed internal configure variable from prefix_TRUE to DO_PNG_PREFIX_TRUE

to be prefixed (suggested by Reuben Hawkins).  This is work in progress that
breaks some non-configure builds.

Added color-tests, silent-rules (Not yet implemented in Makefile.am) and
version checking to configure.ac

This version of autogen.sh attempts to dissuade people from running it when
it is not, or should not, be necessary.

Also some layout regularization and removal of introduced tab characters
(replaced with 3-character indentation).  Obsolete macros identified by
autoupdate have been removed; the replacements are all in 2.59 so
the pre-req hasn't been changed.  --enable-werror checks for support
for -Werror (or the given argument) in the compiler.  This mimics the
gcc configure option by allowing -Werror to be turned on safely; without
the option the tests written in configure itself fail compilation because
they cause compiler warnings.

separate.  The include path of 'config.h' was erroneously made relative in
pngvalid.c in libpng 1.5.7.

problems with build scripts that search for config.h and find an
inappropriate one in the standard paths.

of parallelism during 'make' the use of the same temporary file names such
as 'dfn*' can result in a race where a temporary file from one arm of the
build is deleted or overwritten in another arm.  This changes the
temporary files for suffix rules to always use $* and ensures that the
non-suffix rules use unique file names.

and rebuilt Makefile.in and configure, etc., with autoconf-2.68

instead of ANNOUNCE

adjacent @ signs with a space; this changes the concatentation
from @@@ to PNG_JOIN; that should work with all compiler
preprocessors.

pnglibconf.h.prebuilt