Index: trunk/stac/src/sum.c
===================================================================
--- trunk/stac/src/sum.c	(revision 6887)
+++ trunk/stac/src/sum.c	(revision 8684)
@@ -39,5 +39,5 @@
         } else if (image->numCols != numCols || image->numRows != numRows) {
             psError(PS_ERR_IO, true, "Input images have different dimensions.  %s is %dx%d, but should be "
-                    "%dx%d\n", inputNames->data[i], image->numCols, image->numRows, numCols, numRows);
+                    "%dx%d\n", (char *)inputNames->data[i], image->numCols, image->numRows, numCols, numRows);
             return EXIT_FAILURE;
         }