diff -up netpbm-10.58.01/converter/ppm/ppmtopict.c.ppmtopict netpbm-10.58.01/converter/ppm/ppmtopict.c

--- netpbm-10.58.01/converter/ppm/ppmtopict.c.ppmtopict	2012-06-13 09:52:42.000000000 +0200

+++ netpbm-10.58.01/converter/ppm/ppmtopict.c	2012-06-13 11:33:11.134747363 +0200

@@ -200,7 +200,7 @@ putRow(FILE * const ifP,

        pixel *      const rowpixels,

        char *       const packed) {

-    unsigned int i;

+    int i;

     unsigned int count;

     unsigned int run;

     unsigned int rep;