diff -ru4NwbB libpng-1.5.10/configure.ac libpng-1.5.11rc05/configure.ac
--- libpng-1.5.10/configure.ac	2012-03-29 00:07:02.320295264 -0500
+++ libpng-1.5.11rc05/configure.ac	2012-06-07 09:51:54.049957302 -0500
@@ -146,9 +146,9 @@
     AC_MSG_CHECKING([for symbol prefix])
     SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
                    | ${CPP-${CC-gcc} -E} - 2>&1 \
                    | ${EGREP-grep} "^PREFIX=" \
-                   | ${SED-sed} "s:^PREFIX=::"`
+                  | ${SED-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"`
     AC_SUBST(SYMBOL_PREFIX)
     AC_MSG_RESULT($SYMBOL_PREFIX)
 fi
 
diff -ru4NwbB libpng-1.5.10/contrib/libtests/pngvalid.c libpng-1.5.11rc05/contrib/libtests/pngvalid.c
--- libpng-1.5.10/contrib/libtests/pngvalid.c	2012-01-01 14:49:28.273121000 -0600
+++ libpng-1.5.11rc05/contrib/libtests/pngvalid.c	2012-06-03 19:32:16.756035000 -0500
@@ -243,18 +243,18 @@
     (((do_interlace)!=0)<<15) + ((width)<<16) + ((height)<<24)))
 
 #define COL_FROM_ID(id) ((png_byte)((id)& 0x7U))
 #define DEPTH_FROM_ID(id) ((png_byte)(((id) >> 3) & 0x1fU))
-#define PALETTE_FROM_ID(id) ((int)(((id) >> 8) & 0x1f))
+#define PALETTE_FROM_ID(id) (((id) >> 8) & 0x1f)
 #define INTERLACE_FROM_ID(id) ((int)(((id) >> 13) & 0x3))
 #define DO_INTERLACE_FROM_ID(id) ((int)(((id)>>15) & 1))
 #define WIDTH_FROM_ID(id) (((id)>>16) & 0xff)
 #define HEIGHT_FROM_ID(id) (((id)>>24) & 0xff)
 
 /* Utility to construct a standard name for a standard image. */
 static size_t
 standard_name(char *buffer, size_t bufsize, size_t pos, png_byte colour_type,
-    int bit_depth, int npalette, int interlace_type,
+    int bit_depth, unsigned int npalette, int interlace_type,
     png_uint_32 w, png_uint_32 h, int do_interlace)
 {
    pos = safecat(buffer, bufsize, pos, colour_types[colour_type]);
    if (npalette > 0)
@@ -314,12 +314,13 @@
 
 /* The following defines the number of different palettes to generate for
  * each log bit depth of a colour type 3 standard image.
  */
-#define PALETTE_COUNT(bit_depth) ((bit_depth) > 4 ? 1 : 16)
+#define PALETTE_COUNT(bit_depth) ((bit_depth) > 4 ? 1U : 16U)
 
 static int
-next_format(png_bytep colour_type, png_bytep bit_depth, int* palette_number)
+next_format(png_bytep colour_type, png_bytep bit_depth,
+   unsigned int* palette_number)
 {
    if (*bit_depth == 0)
    {
       *colour_type = 0, *bit_depth = 1, *palette_number = 0;
@@ -3255,10 +3256,10 @@
  * that test odd sizes along with the libpng interlace handling.
  */
 static void
 make_transform_image(png_store* PNG_CONST ps, png_byte PNG_CONST colour_type,
-    png_byte PNG_CONST bit_depth, int palette_number, int interlace_type,
-    png_const_charp name)
+    png_byte PNG_CONST bit_depth, unsigned int palette_number,
+    int interlace_type, png_const_charp name)
 {
    context(ps, fault);
 
    Try
@@ -3383,9 +3384,9 @@
 make_transform_images(png_store *ps)
 {
    png_byte colour_type = 0;
    png_byte bit_depth = 0;
-   int palette_number = 0;
+   unsigned int palette_number = 0;
 
    /* This is in case of errors. */
    safecat(ps->test, sizeof ps->test, 0, "make standard images");
 
@@ -7068,9 +7069,9 @@
 perform_transform_test(png_modifier *pm)
 {
    png_byte colour_type = 0;
    png_byte bit_depth = 0;
-   int palette_number = 0;
+   unsigned int palette_number = 0;
 
    while (next_format(&colour_type, &bit_depth, &palette_number))
    {
       png_uint_32 counter = 0;
@@ -8427,9 +8428,9 @@
 perform_gamma_threshold_tests(png_modifier *pm)
 {
    png_byte colour_type = 0;
    png_byte bit_depth = 0;
-   int palette_number = 0;
+   unsigned int palette_number = 0;
 
    /* Don't test more than one instance of each palette - it's pointless, in
     * fact this test is somewhat excessive since libpng doesn't make this
     * decision based on colour type or bit depth!
@@ -8492,9 +8493,9 @@
 static void perform_gamma_transform_tests(png_modifier *pm)
 {
    png_byte colour_type = 0;
    png_byte bit_depth = 0;
-   int palette_number = 0;
+   unsigned int palette_number = 0;
 
    while (next_format(&colour_type, &bit_depth, &palette_number))
    {
       unsigned int i, j;
@@ -8521,13 +8522,10 @@
     * are tested.
     */
    for (sbit=pm->sbitlow; sbit<(1<<READ_BDHI); ++sbit)
    {
-      png_byte colour_type, bit_depth;
-      int npalette;
-
-      colour_type = bit_depth = 0;
-      npalette = 0;
+      png_byte colour_type = 0, bit_depth = 0;
+      unsigned int npalette = 0;
 
       while (next_format(&colour_type, &bit_depth, &npalette))
          if ((colour_type & PNG_COLOR_MASK_ALPHA) == 0 &&
             ((colour_type == 3 && sbit < 8) ||
@@ -8741,9 +8739,9 @@
    int expand_16)
 {
    png_byte colour_type = 0;
    png_byte bit_depth = 0;
-   int palette_number = 0;
+   unsigned int palette_number = 0;
 
    /* Skip the non-alpha cases - there is no setting of a transparency colour at
     * present.
     */
diff -ru4NwbB libpng-1.5.10/png.c libpng-1.5.11rc05/png.c
--- libpng-1.5.10/png.c	2012-03-29 00:06:54.535945504 -0500
+++ libpng-1.5.11rc05/png.c	2012-06-07 09:51:45.968480411 -0500
@@ -1,8 +1,8 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * Last changed in libpng 1.5.10 [March 8, 2012]
+ * Last changed in libpng 1.5.11 [(PENDING RELEASE)]
  * Copyright (c) 1998-2012 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.)
  *
@@ -968,10 +968,10 @@
     * difficult to be sure that the calculation is stable for real world values
     * and it is certain that it becomes unstable where the end points are close
     * together.
     *
-    * So this code uses the perhaps slighly less optimal but more understandable
-    * and totally obvious approach of calculating color-scale.
+    * So this code uses the perhaps slightly less optimal but more
+    * understandable and totally obvious approach of calculating color-scale.
     *
     * This algorithm depends on the precision in white-scale and that is
     * (1/white-y), so we can immediately see that as white-y approaches 0 the
     * accuracy inherent in the cHRM chunk drops off substantially.
@@ -2043,9 +2043,9 @@
    return 0;
 }
 #endif
 
-#ifdef PNG_READ_GAMMA_SUPPORTED /* more fixed point functions for gammma */
+#ifdef PNG_READ_GAMMA_SUPPORTED /* more fixed point functions for gamma */
 /* Calculate a reciprocal, return 0 on div-by-zero or overflow. */
 png_fixed_point
 png_reciprocal(png_fixed_point a)
 {
diff -ru4NwbB libpng-1.5.10/png.h libpng-1.5.11rc05/png.h
--- libpng-1.5.10/png.h	2012-03-29 00:06:54.479097811 -0500
+++ libpng-1.5.11rc05/png.h	2012-06-07 09:51:45.911146771 -0500
@@ -173,8 +173,10 @@
  *    1.5.9rc01               15    10509  15.so.15.9[.0]
  *    1.5.9                   15    10509  15.so.15.9[.0]
  *    1.5.10beta01-05         15    10510  15.so.15.10[.0]
  *    1.5.10                  15    10510  15.so.15.10[.0]
+ *    1.5.11beta01            15    10511  15.so.15.11[.0]
+ *    1.5.11rc01-05           15    10511  15.so.15.11[.0]
  *
  *   Henceforth the source version will match the shared-library major
  *   and minor numbers; the shared-library major version number will be
  *   used for changes in backward compatibility, as it is intended.  The
diff -ru4NwbB libpng-1.5.10/pngconf.h libpng-1.5.11rc05/pngconf.h
--- libpng-1.5.10/pngconf.h	2012-03-29 00:06:54.486609529 -0500
+++ libpng-1.5.11rc05/pngconf.h	2012-06-07 09:51:45.918604340 -0500
@@ -24,9 +24,9 @@
 
 #ifndef PNG_BUILDING_SYMBOL_TABLE
 /* PNG_NO_LIMITS_H may be used to turn off the use of the standard C
  * definition file for  machine specific limits, this may impact the
- * correctness of the definitons below (see uses of INT_MAX).
+ * correctness of the definitions below (see uses of INT_MAX).
  */
 #  ifndef PNG_NO_LIMITS_H
 #    include <limits.h>
 #  endif
diff -ru4NwbB libpng-1.5.10/pngpread.c libpng-1.5.11rc05/pngpread.c
--- libpng-1.5.10/pngpread.c	2012-03-29 00:06:54.567379144 -0500
+++ libpng-1.5.11rc05/pngpread.c	2012-06-07 09:51:45.999991619 -0500
@@ -1,8 +1,8 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.5.9 [February 18, 2012]
+ * Last changed in libpng 1.5.11 [(PENDING RELEASE)]
  * Copyright (c) 1998-2012 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.)
  *
diff -ru4NwbB libpng-1.5.10/pngpriv.h libpng-1.5.11rc05/pngpriv.h
--- libpng-1.5.10/pngpriv.h	2012-03-29 00:06:54.496932731 -0500
+++ libpng-1.5.11rc05/pngpriv.h	2012-06-07 09:51:45.929160496 -0500
@@ -1258,12 +1258,10 @@
 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
     png_uint_32 length));
 #endif
 
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
     png_infop info_ptr, png_uint_32 length));
-#endif
 
 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
     png_uint_32 chunk_name));
 
diff -ru4NwbB libpng-1.5.10/pngrtran.c libpng-1.5.11rc05/pngrtran.c
--- libpng-1.5.10/pngrtran.c	2012-03-29 00:06:54.612484275 -0500
+++ libpng-1.5.11rc05/pngrtran.c	2012-06-07 09:51:46.033080458 -0500
@@ -1,8 +1,8 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * Last changed in libpng 1.5.10 [March 8, 2012]
+ * Last changed in libpng 1.5.11 [(PENDING RELEASE)]
  * Copyright (c) 1998-2012 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.)
  *
@@ -2300,9 +2300,10 @@
 #endif
 
 #ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED
    /* Added at libpng-1.5.10 */
-   if (row_info->color_type == PNG_COLOR_TYPE_PALETTE)
+   if (row_info->color_type == PNG_COLOR_TYPE_PALETTE &&
+       png_ptr->num_palette_max >= 0)
       png_do_check_palette_indexes(png_ptr, row_info);
 #endif
 
 #ifdef PNG_READ_BGR_SUPPORTED
diff -ru4NwbB libpng-1.5.10/pngset.c libpng-1.5.11rc05/pngset.c
--- libpng-1.5.10/pngset.c	2012-03-29 00:06:54.637034941 -0500
+++ libpng-1.5.11rc05/pngset.c	2012-06-07 09:51:46.058343103 -0500
@@ -1,8 +1,8 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.5.10 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.11 [(PENDING RELEASE)]
  * Copyright (c) 1998-2012 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.)
  *
@@ -148,9 +148,9 @@
     * occur.  Since the fixed point representation is assymetrical it is
     * possible for 1/gamma to overflow the limit of 21474 and this means the
     * gamma value must be at least 5/100000 and hence at most 20000.0.  For
     * safety the limits here are a little narrower.  The values are 0.00016 to
-    * 6250.0, which are truly ridiculous gammma values (and will produce
+    * 6250.0, which are truly ridiculous gamma values (and will produce
     * displays that are all black or all white.)
     */
    if (file_gamma < 16 || file_gamma > 625000000)
       png_warning(png_ptr, "Out of range gamma value ignored");
@@ -1290,10 +1290,12 @@
       png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN;
 }
 #endif /* PNG_BENIGN_ERRORS_SUPPORTED */
 
-#ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   /* Do not report invalid palette index; added at libng-1.5.10 */
+#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
+/* Whether to report invalid palette index; added at libng-1.5.10
+ *   allowed  - one of 0: disable; 1: enable
+ */
 void PNGAPI
 png_set_check_for_invalid_index(png_structp png_ptr, int allowed)
 {
    png_debug(1, "in png_set_check_for_invalid_index");
diff -ru4NwbB libpng-1.5.10/pngtrans.c libpng-1.5.11rc05/pngtrans.c
--- libpng-1.5.10/pngtrans.c	2012-03-29 00:06:54.654457660 -0500
+++ libpng-1.5.11rc05/pngtrans.c	2012-06-07 09:51:46.075815869 -0500
@@ -1,8 +1,8 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * Last changed in libpng 1.5.10 [March 8, 2012]
+ * Last changed in libpng 1.5.11 [(PENDING RELEASE)]
  * Copyright (c) 1998-2012 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.)
  *
@@ -625,9 +625,9 @@
 void /* PRIVATE */
 png_do_check_palette_indexes(png_structp png_ptr, png_row_infop row_info)
 {
    if (png_ptr->num_palette < (1 << row_info->bit_depth) &&
-      png_ptr->num_palette_max >= 0)
+      png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */
    {
       /* Calculations moved outside switch in an attempt to stop different
        * compiler warnings.  'padding' is in *bits* within the last byte, it is
        * an 'int' because pixel_depth becomes an 'int' in the expression below,
@@ -707,9 +707,9 @@
          case 8:
          {
             for (; rp > png_ptr->row_buf; rp--)
             {
-               if (*rp >= png_ptr->num_palette_max)
+               if (*rp > png_ptr->num_palette_max)
                   png_ptr->num_palette_max = (int) *rp;
             }
 
             break;
diff -ru4NwbB libpng-1.5.10/pngwrite.c libpng-1.5.11rc05/pngwrite.c
--- libpng-1.5.10/pngwrite.c	2012-03-29 00:06:54.669727590 -0500
+++ libpng-1.5.11rc05/pngwrite.c	2012-06-07 09:51:46.091213825 -0500
@@ -1,8 +1,8 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * Last changed in libpng 1.5.10 [March 8, 2012]
+ * Last changed in libpng 1.5.11 [(PENDING RELEASE)]
  * Copyright (c) 1998-2012 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.)
  *
@@ -805,9 +805,10 @@
 
 /* Added at libpng-1.5.10 */
 #ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
    /* Check for out-of-range palette index */
-   if(row_info.color_type == PNG_COLOR_TYPE_PALETTE)
+   if (row_info.color_type == PNG_COLOR_TYPE_PALETTE &&
+       png_ptr->num_palette_max >= 0)
       png_do_check_palette_indexes(png_ptr, &row_info);
 #endif
 
    /* Find a filter if necessary, filter the row and write it out. */
diff -ru4NwbB libpng-1.5.10/scripts/makefile.darwin libpng-1.5.11rc05/scripts/makefile.darwin
--- libpng-1.5.10/scripts/makefile.darwin	2012-03-29 00:06:56.508167982 -0500
+++ libpng-1.5.11rc05/scripts/makefile.darwin	2012-06-07 09:51:47.763745180 -0500
@@ -14,12 +14,10 @@
 prefix=/usr/local
 exec_prefix=$(prefix)
 
 # Where the zlib library and include files are located
-#ZLIBLIB=/usr/local/lib
-#ZLIBINC=/usr/local/include
-ZLIBLIB=../zlib
-ZLIBINC=../zlib
+ZLIBLIB=/usr/lib
+ZLIBINC=/usr/include
 
 # Library name:
 LIBNAME = libpng%NN%
 PNGMAJ = %NN%
@@ -36,9 +34,9 @@
 MKDIR_P=mkdir -p
 LN_SF=ln -sf
 RANLIB=ranlib
 RM_F=/bin/rm -f
-ARCH="-arch i386 -arch x86_64"
+ARCH=-arch ppc -arch i386 -arch x86_64
 
 # CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops
 CFLAGS=-I$(ZLIBINC) -W -Wall -O -funroll-loops $(ARCH)
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng%NN% -lz $(ARCH)
@@ -106,9 +104,9 @@
 $(LIBSOMAJ): $(OBJSDLL)
 	$(CC) -dynamiclib \
 	 -install_name $(LIBPATH)/$(LIBSOMAJ) \
 	 -current_version %SONUM% -compatibility_version %SONUM% \
-	 -o $(LIBSOMAJ) \
+ 	 $(ARCH) -o $(LIBSOMAJ) \
 	 $(OBJSDLL) -L$(ZLIBLIB) -lz
 
 pngtest: pngtest.o $(LIBSO)
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
@@ -135,12 +133,12 @@
 
 install-shared: install-headers $(LIBSOMAJ) libpng.pc
 	-@if [ ! -d $(DL) ]; then $(MKDIR_P) $(DL); fi
 	-@$(RM_F) $(DL)/$(LIBSO)
-	-@$(RM_F) $(DL)/$(LIBSOREL)
+	-@$(RM_F) $(DL)/$(LIBSOMAJ)
 	-@$(RM_F) $(DL)/$(OLDSO)
-	cp $(LIBSOMAJ) $(DL)/$(LIBSOREL)
-	chmod 755 $(DL)/$(LIBSOREL)
+	cp $(LIBSOMAJ) $(DL)
+	chmod 755 $(DL)/$(LIBSOMAJ)
 	(cd $(DL); \
 	$(LN_SF) $(LIBSOREL) $(LIBSO); \
 	$(LN_SF) $(LIBSO) $(OLDSO))
 	-@if [ ! -d $(DL)/pkgconfig ]; then $(MKDIR_P) $(DL)/pkgconfig; fi
diff -ru4NwbB libpng-1.5.10/scripts/makefile.freebsd libpng-1.5.11rc05/scripts/makefile.freebsd
--- libpng-1.5.10/scripts/makefile.freebsd	2012-03-29 00:06:56.550848864 -0500
+++ libpng-1.5.11rc05/scripts/makefile.freebsd	2012-06-07 09:51:47.811078598 -0500
@@ -10,10 +10,10 @@
 
 LIB=		png
 SHLIB_MAJOR=	${SHLIB_VER}
 SHLIB_MINOR=	0
-NOPROFILE=	YES
-NOOBJ=          YES
+NO_PROFILE=	YES
+NO_OBJ=          YES
 
 # where make install puts libpng.a and png.h
 DESTDIR=	${PREFIX}
 LIBDIR=		/lib
@@ -24,9 +24,12 @@
 MANDIR=		/man/man
 SYMLINKS=       libpng/png.h ${INCSDIR}/../png.h \
 		libpng/pngconf.h ${INCSDIR}/../pngconf.h \
 		libpng/pnglibconf.h ${INCSDIR}/../pnglibconf.h
+
 LDADD+=         -lm -lz
+#LDADD+=         -lm -lz -lssp_nonshared   # for OSVERSION >= 800000 ?
+
 DPADD+=         ${LIBM} ${LIBZ}
 
 CFLAGS+= -I.