Index: ImageMagick/trunk/coders/png.c
===================================================================
--- ImageMagick/trunk/coders/png.c	(revision 3629)
+++ ImageMagick/trunk/coders/png.c	(revision 3637)
@@ -3107,4 +3107,5 @@
   */
   count=ReadBlob(image,8,(unsigned char *) magic_number);
+  (void) count;
 
   if (memcmp(magic_number,"\211PNG\r\n\032\n",8) != 0)
@@ -3966,4 +3967,5 @@
 
   count=(size_t) ReadBlob(image,8,(unsigned char *) magic_number);
+  (void) count;
 
   if (memcmp(magic_number,"\213JNG\r\n\032\n",8) != 0)
@@ -6948,4 +6950,5 @@
   ping_exclude_cHRM=mng_info->ping_exclude_cHRM;
   ping_exclude_EXIF=mng_info->ping_exclude_EXIF; /* hex-encoded EXIF in zTXt */
+  (void) ping_exclude_EXIF;
   ping_exclude_gAMA=mng_info->ping_exclude_gAMA;
   ping_exclude_cHRM=mng_info->ping_exclude_cHRM;
@@ -6957,4 +6960,5 @@
   ping_exclude_tEXt=mng_info->ping_exclude_tEXt;
   ping_exclude_tRNS=mng_info->ping_exclude_tRNS;
+  (void) ping_exclude_tRNS;
   ping_exclude_vpAg=mng_info->ping_exclude_vpAg;
   ping_exclude_zCCP=mng_info->ping_exclude_zCCP; /* hex-encoded iCCP in zTXt */