--- src/util/png.c.old	2011-09-16 22:43:23.000000000 -0400
+++ src/util/png.c	2011-09-16 23:12:45.000000000 -0400
@@ -2,6 +2,7 @@
 #ifndef _plan9_
 #include <aconfig.h>
 #ifdef USE_PNG
+#include <zlib.h>
 #include <png.h>
 #endif
 #include <stdlib.h>
@@ -31,6 +32,7 @@
     png_structp png_ptr;
     png_infop info_ptr;
     png_color palette[256];
+    png_color_8 sig_bit;
     volatile unsigned short a = 255;
     volatile unsigned char *b = (volatile unsigned char *) &a;
 #ifdef _undefined_
@@ -59,66 +61,73 @@
 	png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
 	return "No memory to create png info structure";
     }
-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
 	png_destroy_write_struct(&png_ptr, &info_ptr);
 	fclose(file);
 	return strerror(errno);
     }
     png_init_io(png_ptr, file);
-    png_set_filter(png_ptr, 0,
-		   PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_PAETH |
-		   PNG_FILTER_UP | PNG_FILTER_AVG);
-    /* set the zlib compression level */
-    /*png_set_compression_level(png_ptr, Z_BEST_COMPRESSION); */
-    png_set_compression_level(png_ptr, Z_DEFAULT_COMPRESSION);
-
-    /* set other zlib parameters */
-    png_set_compression_mem_level(png_ptr, 8);
-    png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
-    png_set_compression_window_bits(png_ptr, 15);
-    png_set_compression_method(png_ptr, 8);
-
-    info_ptr->width = image->width;
-    info_ptr->height = image->height;
-    /*info_ptr->gamma=1.0; */
-    info_ptr->gamma = 0.5;
-    info_ptr->valid |= PNG_INFO_gAMA | PNG_INFO_pHYs;
-    info_ptr->x_pixels_per_unit = (png_uint_32) (100 / image->pixelwidth);
-    info_ptr->y_pixels_per_unit = (png_uint_32) (100 / image->pixelheight);
 
+    int _bit_depth,_color_type,_interlace_type;
 
     switch (image->palette->type) {
     case C256:
 	{
 	    int i;
-	    info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
-	    info_ptr->bit_depth = image->bytesperpixel * 8;
-	    info_ptr->palette = palette;
-	    info_ptr->valid |= PNG_INFO_PLTE;
-	    for (i = 0; i < image->palette->end; i++)
-		info_ptr->palette[i].red = image->palette->rgb[i][0],
-		    info_ptr->palette[i].green = image->palette->rgb[i][1],
-		    info_ptr->palette[i].blue = image->palette->rgb[i][2],
-		    info_ptr->num_palette = image->palette->end;
+	    _color_type = PNG_COLOR_TYPE_PALETTE;
+	    _bit_depth = image->bytesperpixel * 8;
+	    for (i = 0; i < image->palette->end; i++) {
+		palette[i].red = image->palette->rgb[i][0];
+		palette[i].green = image->palette->rgb[i][1];
+		palette[i].blue = image->palette->rgb[i][2];
+	    }
+	    png_set_PLTE(png_ptr,info_ptr,&palette,image->palette->end);
 	}
 	break;
     case SMALLITER:
     case LARGEITER:
     case GRAYSCALE:
-	info_ptr->color_type = PNG_COLOR_TYPE_GRAY;
-	info_ptr->bit_depth = image->bytesperpixel * 8;
+	_color_type = PNG_COLOR_TYPE_GRAY;
+	_bit_depth = image->bytesperpixel * 8;
 	break;
     case TRUECOLOR:
     case TRUECOLOR24:
     case TRUECOLOR16:
-	info_ptr->color_type = PNG_COLOR_TYPE_RGB;
-	info_ptr->bit_depth = 8;
-	info_ptr->sig_bit.red = 8 - image->palette->info.truec.rprec;
-	info_ptr->sig_bit.green = 8 - image->palette->info.truec.gprec;
-	info_ptr->sig_bit.blue = 8 - image->palette->info.truec.bprec;
+	_color_type = PNG_COLOR_TYPE_RGB;
+	_bit_depth = 8;
+	sig_bit.red = 8 - image->palette->info.truec.rprec;
+	sig_bit.green = 8 - image->palette->info.truec.gprec;
+	sig_bit.blue = 8 - image->palette->info.truec.bprec;
+	png_set_sBIT(png_ptr,info_ptr,&sig_bit);
 	break;
     }
-    info_ptr->interlace_type = 0;
+    _interlace_type = 0;
+
+    png_set_IHDR(png_ptr,info_ptr,image->width,image->height,
+	_bit_depth,_color_type,_interlace_type,
+	PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
+
+    /*info_ptr->gamma=1.0; */
+    /* technically should look up screen gamma for this, defaulting to 1.0 */
+    png_set_gamma(png_ptr,1.0,0.5);
+    png_set_pHYs(png_ptr,info_ptr,
+	(png_uint_32) (100 / image->pixelwidth),
+	(png_uint_32) (100 / image->pixelheight),
+	PNG_RESOLUTION_UNKNOWN);
+
+    png_set_filter(png_ptr, 0,
+		   PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_PAETH |
+		   PNG_FILTER_UP | PNG_FILTER_AVG);
+    /* set the zlib compression level */
+    /*png_set_compression_level(png_ptr, Z_BEST_COMPRESSION); */
+    png_set_compression_level(png_ptr, Z_DEFAULT_COMPRESSION);
+
+    /* set other zlib parameters */
+    png_set_compression_mem_level(png_ptr, 8);
+    png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
+    png_set_compression_window_bits(png_ptr, 15);
+    png_set_compression_method(png_ptr, 8);
+
 #ifdef _undefined_
     png_set_text(png_ptr, info_ptr, comments,
 		 sizeof(comments) / sizeof(png_text));
@@ -128,7 +137,7 @@
     /*png_set_filler(png_ptr,0,PNG_FILLER_AFTER); */
     png_set_packing(png_ptr);
     if (image->palette->type & (TRUECOLOR | TRUECOLOR24 | TRUECOLOR16))
-	png_set_shift(png_ptr, &(info_ptr->sig_bit));
+	png_set_shift(png_ptr, &sig_bit);
     if (*b == 255)
 	png_set_swap(png_ptr);
     png_set_bgr(png_ptr);