diff --git a/ANNOUNCE b/ANNOUNCE
index 6c2ae40dd..cbbf4b328 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.6.1beta06 - March 2, 2013
+Libpng 1.6.1beta06 - March 4, 2013
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -67,8 +67,17 @@ Version 1.6.1beta04 [February 27, 2013]
 Version 1.6.1beta05 [March 1, 2013]
   Avoid a possible memory leak in contrib/gregbook/readpng.c
 
-Version 1.6.1beta06 [March 2, 2013]
+Version 1.6.1beta06 [March 4, 2013]
   Better documentation of unknown handling API interactions.
+  Corrected Android builds and corrected libpng.vers with symbol
+    prefixing This adds an API to set optimization options externally,
+    providing an alternative and general solution for the non-portable
+    run-time tests used by the ARM Neon code.  It also makes those tests
+    compile and link on Android.
+  The order of settings vs options in pnglibconf.h is reversed to allow
+    settings to depend on options and options can now set (or override) the
+    defaults for settings.
+
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index d75b9ef80..644c9e577 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4424,8 +4424,16 @@ Version 1.6.1beta04 [February 27, 2013]
 Version 1.6.1beta05 [March 1, 2013]
   Avoid a possible memory leak in contrib/gregbook/readpng.c
 
-Version 1.6.1beta06 [March 2, 2013]
+Version 1.6.1beta06 [March 4, 2013]
   Better documentation of unknown handling API interactions.
+  Corrected Android builds and corrected libpng.vers with symbol
+    prefixing This adds an API to set optimization options externally,
+    providing an alternative and general solution for the non-portable
+    run-time tests used by the ARM Neon code.  It also makes those tests
+    compile and link on Android.
+  The order of settings vs options in pnglibconf.h is reversed to allow
+    settings to depend on options and options can now set (or override) the
+    defaults for settings.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/arm/arm_init.c b/arm/arm_init.c
index 78750d6a4..1e7b9981c 100644
--- a/arm/arm_init.c
+++ b/arm/arm_init.c
@@ -16,16 +16,7 @@
 
 #include "../pngpriv.h"
 
-#if defined(PNG_FILTER_OPTIMIZATIONS) && defined(__arm__) && \
-   defined(__ARM_NEON__)
-/* __arm__ is defined by GCC, MSVC defines _M_ARM to the ARM version number,
- * Andoid intends to define __ANDROID__, however there are bugs in their
- * toolchain; use -D__ANDROID__ to work round this.
- *
- * __ARM_NEON__ is used to ensure that the compiler has the appropriate ARM
- * NEON support
- */
-
+#ifdef PNG_ARM_NEON_SUPPORTED
 #ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */
 #include <signal.h> /* for sig_atomic_t */
 
@@ -45,7 +36,8 @@ png_have_neon(png_structp png_ptr)
     * implemented as below, therefore it is better to cache the result (these
     * function calls may be slow!)
     */
-   return andoid_getCpuFamily() == ANDROID_CPU_FAMILY_ARM &&
+   PNG_UNUSED(png_ptr)
+   return android_getCpuFamily() == ANDROID_CPU_FAMILY_ARM &&
       (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
 }
 #elif defined(__linux__)
@@ -161,15 +153,39 @@ png_have_neon(png_structp png_ptr)
 void
 png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
 {
+#ifdef PNG_ARM_NEON_API_SUPPORTED
+   switch ((pp->options >> PNG_ARM_NEON) & 3)
+   {
+      case PNG_OPTION_UNSET:
+         /* Allow the run-time check to execute if it has been enabled -
+          * thus both API and CHECK can be turned on.  If it isn't supported
+          * this case will fall through to the 'default' below, which just
+          * returns.
+          */
+#endif /* PNG_ARM_NEON_API_SUPPORTED */
 #ifdef PNG_ARM_NEON_CHECK_SUPPORTED
-   static volatile sig_atomic_t no_neon = -1; /* not checked */
+         {
+            static volatile sig_atomic_t no_neon = -1; /* not checked */
 
-   if (no_neon < 0)
-      no_neon = !png_have_neon(pp);
+            if (no_neon < 0)
+               no_neon = !png_have_neon(pp);
 
-   if (no_neon)
-      return;
+            if (no_neon)
+               return;
+         }
+#ifdef PNG_ARM_NEON_API_SUPPORTED
+         break;
+#endif
 #endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
+#ifdef PNG_ARM_NEON_API_SUPPORTED
+      case PNG_OPTION_ON:
+         /* Option turned on */
+         break;
+
+      default: /* OFF or INVALID */
+         return;
+   }
+#endif
 
    /* IMPORTANT: any new external functions used here must be declared using
     * PNG_INTERNAL_FUNCTION in ../pngpriv.h.  This is required so that the
diff --git a/configure.ac b/configure.ac
index 2b36278e3..aa310b5c8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -233,18 +233,27 @@ AC_SUBST([AM_CCASFLAGS], [-Wa,--noexecstack])
 
 AC_ARG_ENABLE([arm-neon],
    AS_HELP_STRING([[[--enable-arm-neon]]],
-      [Enable ARM NEON optimizations: use 'always' to turn off run-time checks]),
-   [if test "${enableval}" = "yes" -o "${enableval}" = "always"; then
-      AC_DEFINE([PNG_FILTER_OPTIMIZATIONS],
-                [png_init_filter_functions_neon],
-                [ARM NEON filter initialization function])
-      AC_DEFINE([PNG_ALIGNED_MEMORY_SUPPORTED], [],
-                [Align row buffers])
-      if test "${enableval}" = "always"; then
-         AC_DEFINE([PNG_NO_ARM_NEON_CHECK], [],
-                   [Turn off run-time checking for ARM NEON support])
-      fi
-    fi])
+      [Enable ARM NEON optimizations: =off, check, api, on:]
+      [off: disable the optimizations; check: use internal checking code]
+      [(deprecated and poorly supported); api: disable by default, enable by]
+      [a call to png_set_option; on: turn on unconditionally.  The]
+      [default is 'on' if __ARM_NEON__ is defined, otherwise 'off'.]),
+   [case "$enableval" in
+      off)
+         AC_DEFINE([PNG_NO_ARM_NEON], [],
+                   [Disable ARM Neon optimizations]);;
+      check)
+         AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
+                   [Check for ARM Neon support at run-time]);;
+      api)
+         AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
+                   [Turn on ARM Neon optimizations at run-time]);;
+      on)
+         AC_DEFINE([PNG_ARM_NEON_SUPPORTED], [],
+                   [Enable ARM Neon optimizations]);;
+      *)
+         AC_MSG_ERROR([arm-neon: option value required (off/check/api/on)]);;
+   esac])
 AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" != "no"])
 
 AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
diff --git a/png.c b/png.c
index 0fd1e9847..d58b3fd8c 100644
--- a/png.c
+++ b/png.c
@@ -768,13 +768,13 @@ png_get_copyright(png_const_structrp png_ptr)
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.6.1beta06 - March 2, 2013" PNG_STRING_NEWLINE \
+     "libpng version 1.6.1beta06 - March 4, 2013" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2013 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE;
 #  else
-      return "libpng version 1.6.1beta06 - March 2, 2013\
+      return "libpng version 1.6.1beta06 - March 4, 2013\
       Copyright (c) 1998-2013 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@@ -4012,6 +4012,27 @@ png_build_gamma_table(png_structrp png_ptr, int bit_depth)
 }
 #endif /* READ_GAMMA */
 
+/* HARDWARE OPTION SUPPORT */
+#ifdef PNG_SET_OPTION_SUPPORTED
+int PNGAPI
+png_set_option(png_structrp png_ptr, int option, int onoff)
+{
+   if (png_ptr != NULL && option >= 0 && option < PNG_OPTION_NEXT &&
+      (option & 1) == 0)
+   {
+      int mask = 3 << option;
+      int setting = (2 + (onoff != 0)) << option;
+      int current = png_ptr->options;
+
+      png_ptr->options = (png_byte)((current & ~mask) | setting);
+
+      return (current & mask) >> option;
+   }
+
+   return PNG_OPTION_INVALID;
+}
+#endif
+
 /* sRGB support */
 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
    defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
diff --git a/png.h b/png.h
index a781197f5..016a8f095 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.1beta06 - March 2, 2013
+ * libpng version 1.6.1beta06 - March 4, 2013
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -11,7 +11,7 @@
  * Authors and maintainers:
  *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.6.1beta06 - March 2, 2013: Glenn
+ *   libpng versions 0.97, January 1998, through 1.6.1beta06 - March 4, 2013: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -201,7 +201,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.6.1beta06, March 2, 2013, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.6.1beta06, March 4, 2013, are
  * Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -313,7 +313,7 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    March 2, 2013
+ *    March 4, 2013
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
@@ -381,7 +381,7 @@
 /* Version information for png.h - this should match the version in png.c */
 #define PNG_LIBPNG_VER_STRING "1.6.1beta06"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.6.1beta06 - March 2, 2013\n"
+     " libpng version 1.6.1beta06 - March 4, 2013\n"
 
 #define PNG_LIBPNG_VER_SONUM   16
 #define PNG_LIBPNG_VER_DLLNUM  16
@@ -3219,6 +3219,47 @@ PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr,
 #  endif
 #endif /* CHECK_FOR_INVALID_INDEX */
 
+/*******************************************************************************
+ *  IMPLEMENTATION OPTIONS
+ *******************************************************************************
+ *
+ * Support for arbitrary implementation-specific optimizations.  The API allows
+ * particular options to be turned on or off.  'Option' is the number of the
+ * option and 'onoff' is 0 (off) or non-0 (on).  The value returned is given
+ * by the PNG_OPTION_ defines below.
+ *
+ * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions,
+ *           are detected at run time, however sometimes it may be impossible
+ *           to do this in user mode, in which case it is necessary to discover
+ *           the capabilities in an OS specific way.  Such capabilities are
+ *           listed here when libpng has support for them and must be turned
+ *           ON by the application if present.
+ *
+ * SOFTWARE: sometimes software optimizations actually result in performance
+ *           decrease on some architectures or systems, or with some sets of
+ *           PNG images.  'Software' options allow such optimizations to be
+ *           selected at run time.
+ */
+#ifdef PNG_SET_OPTION_SUPPORTED
+#ifdef PNG_ARM_NEON_API_SUPPORTED
+#  define PNG_ARM_NEON   0 /* HARDWARE: ARM Neon SIMD instructions supported */
+#endif
+#define PNG_OPTION_NEXT  2 /* Next option - numbers must be even */
+
+/* Return values: NOTE: there are four values and 'off' is *not* zero */
+#define PNG_OPTION_UNSET   0 /* Unset - defaults to off */
+#define PNG_OPTION_INVALID 1 /* Option number out of range */
+#define PNG_OPTION_OFF     2
+#define PNG_OPTION_ON      3
+
+PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option,
+   int onoff));
+#endif
+
+/*******************************************************************************
+ *  END OF HARDWARE OPTIONS
+ ******************************************************************************/
+
 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project
  * defs, scripts/pnglibconf.h, and scripts/pnglibconf.h.prebuilt
  */
@@ -3228,7 +3269,7 @@ PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr,
  * scripts/symbols.def as well.
  */
 #ifdef PNG_EXPORT_LAST_ORDINAL
-  PNG_EXPORT_LAST_ORDINAL(243);
+  PNG_EXPORT_LAST_ORDINAL(244);
 #endif
 
 #ifdef __cplusplus
diff --git a/pngstruct.h b/pngstruct.h
index 776284a73..181b82f77 100644
--- a/pngstruct.h
+++ b/pngstruct.h
@@ -357,6 +357,11 @@ struct png_struct_def
    png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
 #endif
 
+   /* Options */
+#ifdef PNG_SET_OPTION_SUPPORTED
+   png_byte options;           /* On/off state (up to 4 options) */
+#endif
+
 #if PNG_LIBPNG_VER < 10700
 /* To do: remove this from libpng-1.7 */
 #ifdef PNG_TIME_RFC1123_SUPPORTED
diff --git a/scripts/checksym.awk b/scripts/checksym.awk
index 6857dff1c..fe3af55e0 100755
--- a/scripts/checksym.awk
+++ b/scripts/checksym.awk
@@ -113,6 +113,16 @@ END{
       err = 1
    }
    unexported=0
+   # Add a standard header to symbols.new:
+   print ";Version INSERT-VERSION-HERE" >of
+   print ";--------------------------------------------------------------" >of
+   print "; LIBPNG symbol list as a Win32 DEF file" >of
+   print "; Contains all the symbols that can be exported from libpng" >of
+   print ";--------------------------------------------------------------" >of
+   print "LIBRARY" >of
+   print "" >of
+   print "EXPORTS" >of
+
    for (o=1; o<=lasto; ++o) {
       if (symbol[o] == "" && removed[o] == "") {
          if (unexported == 0) unexported = o
diff --git a/scripts/dfn.awk b/scripts/dfn.awk
index 910704594..89b92d5d9 100644
--- a/scripts/dfn.awk
+++ b/scripts/dfn.awk
@@ -61,75 +61,143 @@ $1 ~ /^PNG_DFN_END_SORT/{
 }
 
 /^[^"]*PNG_DFN *".*"[^"]*$/{
-    # A definition line, apparently correctly formated, extract the
-    # definition then replace any doubled "" that remain with a single
-    # double quote.  Notice that the original doubled double quotes
-    # may have been split by tokenization
-    orig=$0
+   # A definition line, apparently correctly formated, extract the
+   # definition then replace any doubled "" that remain with a single
+   # double quote.  Notice that the original doubled double quotes
+   # may have been split by tokenization
+   #
+   # Sometimes GCC splits the PNG_DFN lines, we know this has happened
+   # if the quotes aren't closed and must read another line.  In this
+   # case it is essential to reject lines that start '#' because those
+   # are introduced #line directives.
+   orig=$0
+   line=$0
+   lineno=FNR
+   if (lineno == "") lineno=NR
 
-    if (gsub(/^[^"]*PNG_DFN *"/,"") != 1 || gsub(/"[^"]*$/, "") != 1) {
-	print "line", NR, "processing failed:"
+   if (sub(/^[^"]*PNG_DFN *"/,"",line) != 1) {
+	print "line", lineno ": processing failed:"
 	print orig
-	print $0
 	err=1
-    } else {
+       next
+   } else {
 	++out_count
-    }
+   }
 
-    # Now examine quotes within the value:
-    #
-    #   @" - delete this and any following spaces
-    #   "@ - delete this and any original spaces
-    #   @' - replace this by a double quote
-    #
-    # This allows macro substitution by the C compiler thus:
-    #
-    #   #define first_name John
-    #   #define last_name Smith
-    #
-    #	PNG_DFN"#define name @'@" first_name "@ @" last_name "@@'"
-    #
-    # Might get C preprocessed to:
-    #
-    #   PNG_DFN "#define foo @'@" John "@ @" Smith "@@'"
-    #
-    # Which this script reduces to:
-    #
-    #	#define name "John Smith"
-    #
-    while (sub(/@" */, "")) {
-	if (!sub(/ *"@/, "")) {
-	    print "unbalanced @\" ... \"@ pair"
-	    err=1
-	    break
-	}
-    }
+   # Now examine quotes within the value:
+   #
+   #   @" - delete this and any following spaces
+   #   "@ - delete this and any preceding spaces
+   #   @' - replace this by a double quote
+   #
+   # This allows macro substitution by the C compiler thus:
+   #
+   #   #define first_name John
+   #   #define last_name Smith
+   #
+   #	PNG_DFN"#define name @'@" first_name "@ @" last_name "@@'"
+   #
+   # Might get C preprocessed to:
+   #
+   #   PNG_DFN "#define foo @'@" John "@ @" Smith "@@'"
+   #
+   # Which this script reduces to:
+   #
+   #	#define name "John Smith"
+   #
+   while (1) {
+      # While there is an @" remove it and the next "@
+      if (line ~ /@"/) {
+         if (line ~ /@".*"@/) {
+            # Do this special case first to avoid swallowing extra spaces
+            # before or after the @ stuff:
+            if (!sub(/@" *"@/, "", line)) {
+               # Ok, do it in pieces - there has to be a non-space between the
+               # two.  NOTE: really weird things happen if a leading @" is
+               # lost - the code will error out below (I believe).
+               if (!sub(/@" */, "", line) || !sub(/ *"@/, "", line)) {
+                  print "line", lineno, ": internal error:", orig
+                  exit 1
+               }
+            }
+         }
 
-    # Put any needed double quotes in
-    gsub(/@'/,"\"")
+         # There is no matching "@.  Assume a split line
+         else while (1) {
+            if (getline nextline) {
+               # If the line starts with '#' it is a preprocesor line directive
+               # from cc -E, skip it:
+               if (nextline !~ /^#/) {
+                  line = line " " nextline
+                  break
+               }
+            } else {
+               # This is end-of-input - probably a missig "@ on the first line:
+               print "line", lineno ": unbalanced @\" ... \"@ pair"
+               err=1
+               next
+            }
+         }
 
-    # Remove any trailing spaces (not really required, but for
-    # editorial consistency
-    sub(/ *$/, "")
+         # Keep going until all the @" have gone
+         continue
+      }
 
-    if (sort)
-       array[$(sort)] = $0
+      # Attempt to remove a trailing " (not preceded by '@') - if this can
+      # be done stop now, if not assume a split line again
+      if (sub(/"[^"]*$/, "", line))
+         break
 
-    else
-       print $0 >out
-    next
+      # Read another line
+      while (1) {
+         if (getline nextline) {
+            if (nextline !~ /^#/) {
+               line = line " " nextline
+               # Go back to stripping @" "@ pairs
+               break
+            }
+         } else {
+            print "line", lineno ": unterminated PNG_DFN string"
+            err=1
+            next
+         }
+      }
+   }
+
+   # Put any needed double quotes in (at the end, because these would otherwise
+   # interfere with the processing above.)
+   gsub(/@'/,"\"", line)
+
+   # Remove any trailing spaces (not really required, but for
+   # editorial consistency
+   sub(/ *$/, "", line)
+
+   # Remove trailing CR
+   sub(/
$/, "", line)
+
+   if (sort) {
+      if (split(line, parts) < sort) {
+         print "line", lineno ": missing sort field:", line
+         err=1
+      } else
+         array[parts[sort]] = line
+   }
+
+   else
+      print line >out
+   next
 }
 
 /PNG_DFN/{
-    print "line", NR, "incorrectly formated PNG_DFN line:"
-    print $0
-    err = 1
+   print "line", NR, "incorrectly formated PNG_DFN line:"
+   print $0
+   err = 1
 }
 
 END{
-    if (out_count > 0 || err > 0)
+   if (out_count > 0 || err > 0)
 	exit err
 
-    print "no definition lines found"
-    exit 1
+   print "no definition lines found"
+   exit 1
 }
diff --git a/scripts/options.awk b/scripts/options.awk
index 3fc3ad18b..c3a850173 100755
--- a/scripts/options.awk
+++ b/scripts/options.awk
@@ -64,11 +64,15 @@ BEGIN{
    logunsupported=0             # write unsupported options too
 
    # Precreate arrays
+   # for each option:
    option[""] = ""    # list of all options: default enabled/disabled
    done[""] = 1       # marks option as having been output
    requires[""] = ""  # requires by option
    iffs[""] = ""      # if by option
    enabledby[""] = "" # options that enable it by option
+   sets[""] = ""      # settings set by each option
+   setval[""] = ""    # value to set (indexed: 'option sets[option]')
+   # for each setting:
    setting[""] = ""   # requires by setting
    defaults[""] = ""  # used for a defaulted value
    doneset[""] = 1    # marks setting as having been output
@@ -200,7 +204,7 @@ $1 == "com"{
    if (NF > 1) {
       # sub(/^[ 	]*com[ 	]*/, "")
       $1 = ""
-      print comment, $0, cend >out
+      print comment $0, cend >out
    } else
       print start end >out
    next
@@ -237,7 +241,9 @@ $1 == "file" && NF >= 2{
    next
 }
 
-# option NAME ( (requires|enables|if) NAME* | on | off | disabled )*
+# option NAME ( (requires|enables|if) NAME* | on | off | disabled |
+#                sets SETTING VALUE+ )*
+#     
 #   Declares an option 'NAME' and describes its default setting (disabled)
 #   and its relationship to other options.  The option is disabled
 #   unless *all* the options listed after 'requires' are set and at
@@ -298,7 +304,7 @@ $1 == "option" && NF >= 2{
                   break
                }
             }
-         } else if (val == "requires" || val == "if" || val == "enables") {
+         } else if (val == "requires" || val == "if" || val == "enables" || val =="sets") {
             key = val
          } else if (key == "requires") {
             requires[opt] = requires[opt] " " val
@@ -306,6 +312,12 @@ $1 == "option" && NF >= 2{
             iffs[opt] = iffs[opt] " " val
          } else if (key == "enables") {
             enabledby[val] = enabledby[val] " " opt
+         } else if (key == "sets") {
+            sets[opt] = sets[opt] " " val
+            key = "setval"
+            set = val
+         } else if (key == "setval") {
+            setval[opt " " set] = setval[opt " " set] " " val
          } else
             break # bad line format
       }
@@ -522,83 +534,7 @@ END{
       exit 0
    }
 
-   # Do the 'setting' values first, the algorithm the standard
-   # tree walk (O(1)) done in an O(2) while/for loop; interations
-   # settings x depth, outputing the deepest required macros
-   # first.
-   print "" >out
-   print "/* SETTINGS */" >out
-   print comment, "settings", cend >out
-   # Sort (in dfn.awk) on field 2, the setting name
-   print "PNG_DFN_START_SORT 2" >out
-   finished = 0
-   while (!finished) {
-      finished = 1
-      movement = 0 # done nothing
-      for (i in setting) if (!doneset[i]) {
-         nreqs = split(setting[i], r)
-         if (nreqs > 0) {
-            for (j=1; j<=nreqs; ++j) if (!doneset[r[j]]) {
-               break
-            }
-            if (j<=nreqs) {
-               finished = 0
-               continue # try a different setting
-            }
-         }
-
-         # All the requirements have been processed, output
-         # this setting.
-         if (deb) print "setting", i
-         deflt = defaults[i]
-         # A leading @ means leave it unquoted so the preprocessor
-         # can substitute the build time value
-         if (deflt ~ /^ @/)
-            deflt = " " subs substr(deflt, 3) sube
-         # Remove any spurious trailing spaces
-         sub(/ *$/,"",deflt)
-         print "" >out
-         print "/* setting: ", i >out
-         print " *   requires:" setting[i] >out
-         print " *   default: ", defaults[i] defltinfo, "*/" >out
-         if (defaults[i] == "") { # no default, only check if defined
-            print "#ifdef PNG_" i >out
-         }
-         for (j=1; j<=nreqs; ++j) {
-            print "# ifndef PNG_" r[j] >out
-            print error, i, "requires", r[j] end >out
-            print "# endif" >out
-         }
-         if (defaults[i] != "") { # default handling
-            print "#ifdef PNG_" i >out
-         }
-         # PNG_<i> is defined, so substitute the value:
-         print def i, subs "PNG_" i sube end >out
-         if (defaults[i] != "") {
-            print "#else /*default*/" >out
-            # And add the default definition for the benefit
-            # of later settings an options test:
-            print "# define PNG_" i deflt >out
-            print def i deflt end >out
-         }
-         print "#endif" >out
-
-         doneset[i] = 1
-         ++movement
-      }
-
-      if (!finished && !movement) {
-         print "setting: loop or missing setting in 'requires', cannot process:"
-         for (i in setting) if (!doneset[i]) {
-            print "  setting", i, "requires" setting[i]
-         }
-         exit 1
-      }
-   }
-   print "PNG_DFN_END_SORT" >out
-   print comment, "end of settings", cend >out
-
-   # Now do the options - somewhat more complex.  The dependency
+   # Do the options first (allowing options to set settings).  The dependency
    # tree is thus:
    #
    #   name     >     name
@@ -690,7 +626,7 @@ END{
    }
    if (err) exit 1
 
-   # Sort options too
+   # Sort options:
    print "PNG_DFN_START_SORT 2" >out
 
    # option[i] is now the complete list of all the tokens we may
@@ -730,8 +666,9 @@ END{
          print "" >out
          print "/* option:", i, option[i] >out
          print " *   requires:  " requires[i] >out
-         print " *   if:      " iffs[i] >out
-         print " *   enabled-by:" enabledby[i], "*/" >out
+         print " *   if:        " iffs[i] >out
+         print " *   enabled-by:" enabledby[i] >out
+         print " *   sets:      " sets[i], "*/" >out
          print "#undef PNG_on" >out
          print "#define PNG_on 1" >out
 
@@ -814,6 +751,21 @@ END{
             print error, i, "is on: enabled by:" iffs[i] enabledby[i] ", requires" requires[i] end >out
          } else if (i !~ /^ok_/) {
             print def i sup >out
+            # Supported option, set required settings
+            nreqs = split(sets[i], r)
+            for (j=1; j<=nreqs; ++j) {
+               print "#    ifdef PNG_set_" r[j] >out
+               # Some other option has already set a value:
+               print error, i, "sets", r[j] ": duplicate setting" end >out
+               print error, "   previous value: " end "PNG_set_" r[j] >out
+               print "#    else" >out
+               # Else set the default: note that this won't accept arbitrary
+               # values, the setval string must be acceptable to all the C
+               # compilers we use.  That means it must be VERY simple; a number,
+               # a name or a string.
+               print "#     define PNG_set_" r[j], setval[i " " r[j]] >out
+               print "#    endif" >out
+            }
          }
          print "#   endif /* definition */" >out
          print "#endif /*requires, if*/" >out
@@ -847,6 +799,93 @@ END{
    print "PNG_DFN_END_SORT" >out
    print comment, "end of options", cend >out
 
+   # Do the 'setting' values second, the algorithm the standard
+   # tree walk (O(1)) done in an O(2) while/for loop; interations
+   # settings x depth, outputing the deepest required macros
+   # first.
+   print "" >out
+   print "/* SETTINGS */" >out
+   print comment, "settings", cend >out
+   # Sort (in dfn.awk) on field 2, the setting name
+   print "PNG_DFN_START_SORT 2" >out
+   finished = 0
+   while (!finished) {
+      finished = 1
+      movement = 0 # done nothing
+      for (i in setting) if (!doneset[i]) {
+         nreqs = split(setting[i], r)
+         if (nreqs > 0) {
+            # By default assume the requires values are options, but if there
+            # is no option with that name check for a setting
+            for (j=1; j<=nreqs; ++j) if (option[r[j]] == "" && !doneset[r[j]]) {
+               break
+            }
+            if (j<=nreqs) {
+               finished = 0
+               continue # try a different setting
+            }
+         }
+
+         # All the requirements have been processed, output
+         # this setting.
+         if (deb) print "setting", i
+         deflt = defaults[i]
+         # Remove any spurious trailing spaces
+         sub(/ *$/,"",deflt)
+         # A leading @ means leave it unquoted so the preprocessor
+         # can substitute the build time value
+         if (deflt ~ /^ @/)
+            deflt = " " subs substr(deflt, 3) sube
+         print "" >out
+         print "/* setting: ", i >out
+         print " *   requires:" setting[i] >out
+         print " *   default: ", defaults[i] deflt, "*/" >out
+         for (j=1; j<=nreqs; ++j) {
+            if (option[r[j]] != "")
+               print "#ifndef PNG_" r[j] "_SUPPORTED" >out
+            else
+               print "#ifndef PNG_" r[j] >out
+            print error, i, "requires", r[j] end >out
+            print "# endif" >out
+         }
+         # The precedence is:
+         #
+         #  1) External definition; trumps:
+         #  2) Option 'sets' value; trumps:
+         #  3) Setting 'default'
+         #
+         print "#ifdef PNG_" i >out
+         # PNG_<i> is defined, so substitute the value:
+         print def i, subs "PNG_" i sube end >out
+         print "#else /* use default */" >out
+         print "# ifdef PNG_set_" i >out
+         # Value from an option 'sets' argument
+         print def i, subs "PNG_set_" i sube end >out
+         # This is so that subsequent tests on the setting work:
+         print "#  define PNG_" i, "1" >out
+         if (defaults[i] != "") {
+            print "# else /*default*/" >out
+            print def i deflt end >out
+            print "#  define PNG_" i, "1" >out
+         }
+         print "# endif /* defaults */" >out
+         print "#endif /* setting", i, "*/" >out
+
+         doneset[i] = 1
+         ++movement
+      }
+
+      if (!finished && !movement) {
+         print "setting: loop or missing setting in 'requires', cannot process:"
+         for (i in setting) if (!doneset[i]) {
+            print "  setting", i, "requires" setting[i]
+         }
+         exit 1
+      }
+   }
+   print "PNG_DFN_END_SORT" >out
+   print comment, "end of settings", cend >out
+
    # Regular end - everything looks ok
    if (protect != "") {
       print start "#endif", "/*", protect, "*/" end >out
diff --git a/scripts/pnglibconf.dfa b/scripts/pnglibconf.dfa
index 5f607e1c1..c95b10255 100755
--- a/scripts/pnglibconf.dfa
+++ b/scripts/pnglibconf.dfa
@@ -27,7 +27,7 @@ file pnglibconf.h scripts/pnglibconf.dfa PNGLCONF_H
 # The syntax is detailed in scripts/options.awk; this is a summary
 # only:
 #
-# setting <name> [default]
+# setting <name> [requires ...] [default]
 #    #define PNG_<name> <value>  /* value comes from current setting */
 # option <name> [requires ...] [if ...] [enables ...] [disabled]
 #    #define PNG_<name>_SUPPORTED if the requirements are met and
@@ -158,6 +158,12 @@ logunsupported = 1
 @#  endif
 @#endif
 
+# This changes the default for the ARM NEON optimizations according to
+# __ARM_NEON__
+@#ifdef __ARM_NEON__
+@#  define PNG_ARM_NEON_SUPPORTED
+@#endif
+
 # IN DEVELOPMENT
 # These are currently experimental features; define them if you want (NOTE:
 # experimental options must be disabled before they are defined in this file!)
@@ -199,11 +205,22 @@ setting DEFAULT_READ_MACROS default 1
 
 setting FILTER_OPTIMIZATIONS
 
-# This option turns on runtime checks for ARM NEON support, it is irrelevant
-# on other platforms and it is irrelevant unless NEON code is turned on.  Checks
-# are on by default
+# Implementation specific control of the optimizations, enabled by those
+# hardware or software options that need it (typically when run-time choices
+# must be made by the user)
+option SET_OPTION disabled
 
-option ARM_NEON_CHECK
+# These options are specific to the ARM NEON hardware optimizations:
+#
+# ARM_NEON: the optimization itself
+# ARM_NEON_API: allow the optimization to be switched on with png_set_hardware
+# ARM_NEON_CHECK: compile a run-time check to see if Neon extensions are
+#                 supported, this is poorly supported and deprectated - use the
+#                 png_set_hardware API.
+option ARM_NEON disabled,
+   sets FILTER_OPTIMIZATIONS png_init_filter_functions_neon
+option ARM_NEON_API disabled enables SET_OPTION ARM_NEON
+option ARM_NEON_CHECK disabled enables ARM_NEON
 
 # These settings configure the default compression level (0-9) and 'strategy';
 # strategy is as defined by the implementors of zlib, it describes the input
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index 4d08a28a5..91b136cd4 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -1,9 +1,8 @@
-
-/* libpng STANDARD API DEFINITION */
+/* libpng 1.6.1beta06 STANDARD API DEFINITION */
 
 /* pnglibconf.h - library build configuration */
 
-/* Libpng 1.6.1beta06 - March 2, 2013 */
+/* Libpng version 1.6.1beta06 - March 4, 2013 */
 
 /* Copyright (c) 1998-2013 Glenn Randers-Pehrson */
 
@@ -12,40 +11,16 @@
 /* and license in png.h */
 
 /* pnglibconf.h */
+/* Machine generated file: DO NOT EDIT */
 /* Derived from: scripts/pnglibconf.dfa */
-/* If you edit this file by hand you must obey the rules expressed in */
-/* pnglibconf.dfa with respect to the dependencies between the following */
-/* symbols.  It is much better to generate a new file using */
-/* scripts/libpngconf.mak */
-
 #ifndef PNGLCONF_H
 #define PNGLCONF_H
-/* settings */
-#define PNG_API_RULE 0
-#define PNG_CALLOC_SUPPORTED
-#define PNG_COST_SHIFT 3
-#define PNG_DEFAULT_READ_MACROS 1
-#define PNG_GAMMA_THRESHOLD_FIXED 5000
-#define PNG_IDAT_READ_SIZE PNG_ZBUF_SIZE
-#define PNG_INFLATE_BUF_SIZE 1024
-#define PNG_MAX_GAMMA_8 11
-#define PNG_QUANTIZE_BLUE_BITS 5
-#define PNG_QUANTIZE_GREEN_BITS 5
-#define PNG_QUANTIZE_RED_BITS 5
-#define PNG_TEXT_Z_DEFAULT_COMPRESSION (-1)
-#define PNG_TEXT_Z_DEFAULT_STRATEGY 0
-#define PNG_WEIGHT_SHIFT 8
-#define PNG_ZBUF_SIZE 8192
-#define PNG_Z_DEFAULT_COMPRESSION (-1)
-#define PNG_Z_DEFAULT_NOFILTER_STRATEGY 0
-#define PNG_Z_DEFAULT_STRATEGY 1
-#define PNG_sCAL_PRECISION 5
-#define PNG_sRGB_PROFILE_CHECKS 2
-/* end of settings */
 /* options */
 #define PNG_16BIT_SUPPORTED
 #define PNG_ALIGNED_MEMORY_SUPPORTED
-#define PNG_ARM_NEON_CHECK_SUPPORTED
+/*#undef PNG_ARM_NEON_API_SUPPORTED*/
+/*#undef PNG_ARM_NEON_CHECK_SUPPORTED*/
+/*#undef PNG_ARM_NEON_SUPPORTED*/
 #define PNG_BENIGN_ERRORS_SUPPORTED
 #define PNG_BENIGN_READ_ERRORS_SUPPORTED
 /*#undef PNG_BENIGN_WRITE_ERRORS_SUPPORTED*/
@@ -130,6 +105,7 @@
 #define PNG_SETJMP_SUPPORTED
 #define PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED
 #define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
+/*#undef PNG_SET_OPTION_SUPPORTED*/
 #define PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
 #define PNG_SET_USER_LIMITS_SUPPORTED
 #define PNG_SIMPLIFIED_READ_AFIRST_SUPPORTED
@@ -210,4 +186,26 @@
 #define PNG_tRNS_SUPPORTED
 #define PNG_zTXt_SUPPORTED
 /* end of options */
+/* settings */
+#define PNG_API_RULE 0
+#define PNG_CALLOC_SUPPORTED
+#define PNG_COST_SHIFT 3
+#define PNG_DEFAULT_READ_MACROS 1
+#define PNG_GAMMA_THRESHOLD_FIXED 5000
+#define PNG_IDAT_READ_SIZE PNG_ZBUF_SIZE
+#define PNG_INFLATE_BUF_SIZE 1024
+#define PNG_MAX_GAMMA_8 11
+#define PNG_QUANTIZE_BLUE_BITS 5
+#define PNG_QUANTIZE_GREEN_BITS 5
+#define PNG_QUANTIZE_RED_BITS 5
+#define PNG_TEXT_Z_DEFAULT_COMPRESSION (-1)
+#define PNG_TEXT_Z_DEFAULT_STRATEGY 0
+#define PNG_WEIGHT_SHIFT 8
+#define PNG_ZBUF_SIZE 8192
+#define PNG_Z_DEFAULT_COMPRESSION (-1)
+#define PNG_Z_DEFAULT_NOFILTER_STRATEGY 0
+#define PNG_Z_DEFAULT_STRATEGY 1
+#define PNG_sCAL_PRECISION 5
+#define PNG_sRGB_PROFILE_CHECKS 2
+/* end of settings */
 #endif /* PNGLCONF_H */
diff --git a/scripts/symbols.def b/scripts/symbols.def
index 9a6536d95..d7b34181a 100644
--- a/scripts/symbols.def
+++ b/scripts/symbols.def
@@ -1,3 +1,4 @@
+;Version 1.6.1beta06
 ;--------------------------------------------------------------
 ; LIBPNG symbol list as a Win32 DEF file
 ; Contains all the symbols that can be exported from libpng
@@ -5,7 +6,6 @@
 LIBRARY
 
 EXPORTS
-;Version 1.6.1beta06
  png_access_version_number @1
  png_set_sig_bytes @2
  png_sig_cmp @3
@@ -248,3 +248,4 @@ EXPORTS
  png_convert_to_rfc1123_buffer @241
  png_set_check_for_invalid_index @242
  png_get_palette_max @243
+ png_set_option @244
diff --git a/scripts/symbols.dfn b/scripts/symbols.dfn
index 99d992eb1..6f52918d4 100644
--- a/scripts/symbols.dfn
+++ b/scripts/symbols.dfn
@@ -35,13 +35,14 @@
  * defaulted to 'off' in scripts/pnglibconf.dfa
  *
  * Maintenance: if scripts/pnglibconf.dfa options are changed
- * from, or to, 'off' this needs updating!
+ * from, or to, 'disabled' this needs updating!
  */
 #define PNG_BENIGN_ERRORS_SUPPORTED
 #define PNG_ERROR_NUMBERS_SUPPORTED
 #define PNG_READ_BIG_ENDIAN_SUPPORTED  /* should do nothing! */
 #define PNG_INCH_CONVERSIONS_SUPPORTED
 #define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+#define PNG_SET_OPTION_SUPPORTED
 
 #undef PNG_H
 #include "../png.h"