diff -up netpbm-10.35.58/lib/libpm.c.64bitfix netpbm-10.35.58/lib/libpm.c
--- netpbm-10.35.58/lib/libpm.c.64bitfix	2009-01-22 08:49:25.000000000 +0100
+++ netpbm-10.35.58/lib/libpm.c	2009-01-22 08:50:38.000000000 +0100
@@ -1069,7 +1069,7 @@
 pm_readbiglong(FILE * const ifP, 
                long * const lP) {
 
-    int c;
+    unsigned int c;
     unsigned long l;
 
     c = getc(ifP);
@@ -1148,7 +1148,7 @@
 int
 pm_readlittlelong(FILE * const ifP, 
                   long * const lP) {
-    int c;
+    unsigned int c;
     unsigned long l;
 
     c = getc(ifP);