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