Index: netpbm-10.35.80/converter/other/pngtopnm.c
===================================================================
--- netpbm-10.35.80.orig/converter/other/pngtopnm.c
+++ netpbm-10.35.80/converter/other/pngtopnm.c
@@ -44,12 +44,6 @@
 #include "nstring.h"
 #include "shhopt.h"
 
-#if PNG_LIBPNG_VER >= 10400
-#error Your PNG library (<png.h>) is incompatible with this Netpbm source code.
-#error You need either an older PNG library (older than 1.4)
-#error newer Netpbm source code (at least 10.48)
-#endif
-
 typedef struct _jmpbuf_wrapper {
   jmp_buf jmpbuf;
 } jmpbuf_wrapper;
@@ -482,7 +476,7 @@ isTransparentColor(pngcolor   const colo
     bool retval;
 
     if (info_ptr->valid & PNG_INFO_tRNS) {
-        const png_color_16 * const transColorP = &info_ptr->trans_values;
+        const png_color_16 * const transColorP = &info_ptr->trans_color;
     
 
         /* There seems to be a problem here: you can't compare real
@@ -575,8 +569,8 @@ paletteHasPartialTransparency(png_info *
             for (i = 0, foundGray = FALSE;
                  i < info_ptr->num_trans && !foundGray;
                  ++i) {
-                if (info_ptr->trans[i] != 0 &&
-                    info_ptr->trans[i] != maxval) {
+                if (info_ptr->trans_alpha[i] != 0 &&
+                    info_ptr->trans_alpha[i] != maxval) {
                     foundGray = TRUE;
                 }
             }
@@ -647,7 +641,7 @@ setupSignificantBits(png_struct *
                 unsigned int i;
                 trans_mix = TRUE;
                 for (i = 0; i < info_ptr->num_trans; ++i)
-                    if (info_ptr->trans[i] != 0 && info_ptr->trans[i] != 255) {
+                    if (info_ptr->trans_alpha[i] != 0 && info_ptr->trans_alpha[i] != 255) {
                         trans_mix = FALSE;
                         break;
                     }
@@ -885,7 +879,7 @@ writePnm(FILE *              const ofP,
                 setXel(&xelrow[col], fgColor, bgColor, alpha_handling,
                        ((info_ptr->valid & PNG_INFO_tRNS) &&
                         (fgColor.r == 
-                         gamma_correct(info_ptr->trans_values.gray,
+                         gamma_correct(info_ptr->trans_color.gray,
                                        totalgamma))) ?
                        0 : maxval);
             }
@@ -914,7 +908,7 @@ writePnm(FILE *              const ofP,
                 setXel(&xelrow[col], fgColor, bgColor, alpha_handling,
                        (info_ptr->valid & PNG_INFO_tRNS) &&
                        index < info_ptr->num_trans ?
-                       info_ptr->trans[index] : maxval);
+                       info_ptr->trans_alpha[index] : maxval);
             }
             break;
                 
Index: netpbm-10.35.80/converter/other/pnmtopng.c
===================================================================
--- netpbm-10.35.80.orig/converter/other/pnmtopng.c
+++ netpbm-10.35.80/converter/other/pnmtopng.c
@@ -69,13 +69,6 @@
 #include "nstring.h"
 #include "version.h"
 
-#if PNG_LIBPNG_VER >= 10400
-#error Your PNG library (<png.h>) is incompatible with this Netpbm source code.
-#error You need either an older PNG library (older than 1.4)
-#error newer Netpbm source code (at least 10.47.04)
-#endif
-
-
 struct zlibCompression {
     /* These are parameters that describe a form of zlib compression.
        Values have the same meaning as the similarly named arguments to
@@ -2612,7 +2605,7 @@ convertpnm(struct cmdlineInfo const cmdl
     info_ptr->num_palette = palette_size;
     if (trans_size > 0) {
         info_ptr->valid |= PNG_INFO_tRNS;
-        info_ptr->trans = trans;
+        info_ptr->trans_alpha = trans;
         info_ptr->num_trans = trans_size;   /* omit opaque values */
     }
     /* creating hIST chunk */
@@ -2649,7 +2642,7 @@ convertpnm(struct cmdlineInfo const cmdl
         info_ptr->color_type == PNG_COLOR_TYPE_RGB) {
         if (transparent > 0) {
             info_ptr->valid |= PNG_INFO_tRNS;
-            info_ptr->trans_values = 
+            info_ptr->trans_color = 
                 xelToPngColor_16(transcolor, maxval, png_maxval);
         }
     } else {
@@ -2661,10 +2654,10 @@ convertpnm(struct cmdlineInfo const cmdl
         if (info_ptr->valid && PNG_INFO_tRNS) 
             pm_message("Transparent color {gray, red, green, blue} = "
                        "{%d, %d, %d, %d}",
-                       info_ptr->trans_values.gray,
-                       info_ptr->trans_values.red,
-                       info_ptr->trans_values.green,
-                       info_ptr->trans_values.blue);
+                       info_ptr->trans_color.gray,
+                       info_ptr->trans_color.red,
+                       info_ptr->trans_color.green,
+                       info_ptr->trans_color.blue);
         else
             pm_message("No transparent color");
     }