--- a/gif2png.c	2012-01-29 00:02:06.000000000 +0100
+++ b/gif2png.c	2012-02-06 00:49:14.000000000 +0100
@@ -12,6 +12,7 @@
 #include <unistd.h>	/* for isatty() */
 #include <sys/stat.h>
 #include <utime.h>
+#include <zlib.h>
 
 #if !defined(TRUE)
 #define FALSE	0
@@ -122,8 +123,8 @@
     int colors_used = 0;
     byte remap[MAXCMSIZE];
     int low_prec;
-    png_struct *png_ptr = xalloc(sizeof (png_struct));
-    png_info *info_ptr = xalloc(sizeof (png_info));
+    png_struct *png_ptr;
+    png_info *info_ptr;
     int p;
     int gray_bitdepth;
     png_color pal_rgb[MAXCMSIZE], *pltep;
@@ -138,6 +139,19 @@
     png_text software;
     png_text comment;
 
+    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+    if (png_ptr == NULL) {
+      fprintf(stderr, "gif2png: fatal error, out of memory\n");
+      fprintf(stderr, "gif2png: exiting ungracefully\n");
+      exit(1);
+    }
+    info_ptr = png_create_info_struct(png_ptr);
+    if (info_ptr == NULL) {
+      fprintf(stderr, "gif2png: fatal error, out of memory\n");
+      fprintf(stderr, "gif2png: exiting ungracefully\n");
+      exit(1);
+    }
+
     /* these volatile declarations prevent gcc warnings ("variable might be
      *  clobbered by `longjmp' or `vfork'") */
     volatile int gray = TRUE;