[master] Update configure scripts to autoconf-2.64

Makefile.am

@@ -2,9 +2,9 @@
 #   Source file for Makefile.in (and hence Makefile)
 #
 # Makefile.am need only be changed on a major version number
-# change (e.g. libpng12 --> libpng13).  In that case seach
+# change (e.g. libpng12 --> libpng14).  In that case seach
 # this file for every instance of the old base name (libpng12)
-# and change to the new one (libpng13), then change the
+# and change to the new one (libpng14), then change the
 # -version-number settings below so that the new values have
 # the correct major part (first field).
 

Makefile.in

@@ -19,9 +19,9 @@
 #   Source file for Makefile.in (and hence Makefile)
 #
 # Makefile.am need only be changed on a major version number
-# change (e.g. libpng12 --> libpng13).  In that case seach
+# change (e.g. libpng12 --> libpng14).  In that case seach
 # this file for every instance of the old base name (libpng12)
-# and change to the new one (libpng13), then change the
+# and change to the new one (libpng14), then change the
 # -version-number settings below so that the new values have
 # the correct major part (first field).
 
@@ -106,14 +106,14 @@ libpng_la_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
 	$(libpng_la_LDFLAGS) $(LDFLAGS) -o $@
 libpng12_la_LIBADD =
-am_libpng12_la_OBJECTS = libpng12_la-png.lo libpng12_la-pngset.lo \
-	libpng12_la-pngget.lo libpng12_la-pngrutil.lo \
-	libpng12_la-pngtrans.lo libpng12_la-pngwutil.lo \
-	libpng12_la-pngread.lo libpng12_la-pngrio.lo \
-	libpng12_la-pngwio.lo libpng12_la-pngwrite.lo \
-	libpng12_la-pngrtran.lo libpng12_la-pngwtran.lo \
-	libpng12_la-pngmem.lo libpng12_la-pngerror.lo \
-	libpng12_la-pngpread.lo
+am_libpng12_la_OBJECTS = libpng12_la-png.lo \
+	libpng12_la-pngset.lo libpng12_la-pngget.lo \
+	libpng12_la-pngrutil.lo libpng12_la-pngtrans.lo \
+	libpng12_la-pngwutil.lo libpng12_la-pngread.lo \
+	libpng12_la-pngrio.lo libpng12_la-pngwio.lo \
+	libpng12_la-pngwrite.lo libpng12_la-pngrtran.lo \
+	libpng12_la-pngwtran.lo libpng12_la-pngmem.lo \
+	libpng12_la-pngerror.lo libpng12_la-pngpread.lo
 libpng12_la_OBJECTS = $(am_libpng12_la_OBJECTS)
 libpng12_la_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
@@ -218,6 +218,7 @@ PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
 PACKAGE_NAME = @PACKAGE_NAME@
 PACKAGE_STRING = @PACKAGE_STRING@
 PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
 PNGLIB_MAJOR = @PNGLIB_MAJOR@
@@ -319,8 +320,9 @@ libpng_la_CPPFLAGS = @LIBPNG_DEFINES@
 libpng12_la_CPPFLAGS = @LIBPNG_DEFINES@
 
 # MAJOR UPGRADE: the version-number settings below must be changed.
-libpng12_la_LDFLAGS = -no-undefined -export-dynamic -version-number \
-	0:@PNGLIB_RELEASE@:0 $(am__append_1) $(am__append_2)
+libpng12_la_LDFLAGS = -no-undefined -export-dynamic \
+	-version-number 0:@PNGLIB_RELEASE@:0 $(am__append_1) \
+	$(am__append_2)
 # -rpath is needed as automake doesn't know the directory
 libpng_la_LDFLAGS = -rpath '$(libdir)' -no-undefined -export-dynamic \
 	-version-number 3:@PNGLIB_RELEASE@:0

aclocal.m4

@@ -13,8 +13,8 @@
 
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
-m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.63],,
-[m4_warning([this file was generated for autoconf 2.63.
+m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.64],,
+[m4_warning([this file was generated for autoconf 2.64.
 You have another version of autoconf.  It may work, but is not guaranteed to.
 If you have problems, you may need to regenerate the build system entirely.
 To do so, use the procedure documented by the package, typically `autoreconf'.])])

config.h.in

@@ -64,6 +64,9 @@
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
 
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 

libpng.3

@@ -825,8 +825,10 @@ libpng.txt - A description on how to use and modify libpng
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2009 Glenn Randers-Pehrson
- For conditions of distribution and use, see copyright
- notice in png.h.
+
+ This document is released under the libpng license.
+ For conditions of distribution and use, see the disclaimer
+ and license in png.h
 
  Based on:
 
@@ -3755,7 +3757,9 @@ when the Intel assembler code was removed due to a licensing issue.
 The png_get_io_ptr() function has been present since libpng-0.88, has never
 changed, and is unaffected by conditional compilation macros.  It is the
 best choice for use in configure scripts for detecting the presence of any
-libpng version since 0.88.
+libpng version since 0.88.  In an autoconf "configure.in" you could use
+
+    AC_CHECK_LIB(png, png_get_io_ptr, ...
 
 .SH XI. Source code repository
 
@@ -3832,7 +3836,10 @@ exported functions are marked with PNGAPI:
     body;
  }
 
-The prototypes for all exported functions appear in png.h.
+The prototypes for all exported functions appear in png.h,
+above the comment that says
+
+    /* Maintainer: Put new public prototypes here ... */
 
 We mark all non-exported functions with "/* PRIVATE */"":
 
@@ -3842,9 +3849,12 @@ We mark all non-exported functions with "/* PRIVATE */"":
     body;
  }
 
-The prototypes for non-exported functions can appear in
+The prototypes for non-exported functions (except for those in
+pngtest) appear in
 the PNG_INTERNAL section of png.h
-or in the file where the function is located.
+above the comment that says
+
+  /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
 
 The names of all exported functions and variables begin
 with  "png_", and all publicly visible C preprocessor