diff -pruN paps-0.6.8.orig/src/paps.c paps-0.6.8/src/paps.c
--- paps-0.6.8.orig/src/paps.c	2008-09-01 15:54:11.000000000 +0900
+++ paps-0.6.8/src/paps.c	2008-09-01 15:54:47.000000000 +0900
@@ -365,7 +365,7 @@ int main(int argc, char *argv[])
       if (!IN)
         {
           fprintf(stderr, "Failed to open %s!\n", filename_in);
-          exit(-1);
+          exit(1);
         }
     }
   else
@@ -499,7 +499,7 @@ int main(int argc, char *argv[])
       if (cvh == NULL)
         {
           fprintf(stderr, "%s: Invalid encoding: %s\n", g_get_prgname (), encoding);
-          exit(-1);
+          exit(1);
         }
     }
 
@@ -559,7 +559,7 @@ read_file (FILE   *file,
         {
           fprintf(stderr, "%s: Error reading file.\n", g_get_prgname ());
           g_string_free (inbuf, TRUE);
-          return NULL;
+          exit(1);
         }
       else if (bp == NULL)
         break;
@@ -573,7 +573,7 @@ read_file (FILE   *file,
           if (g_iconv (handle, &ib, &iblen, &ob, &oblen) == -1)
             {
               fprintf (stderr, "%s: Error while converting strings.\n", g_get_prgname ());
-              return NULL;
+              exit(1);
             }
           obuffer[BUFSIZE * 6 - 1 - oblen] = 0;
         }
@@ -637,7 +637,7 @@ split_text_into_paragraphs (PangoContext
 	      if (wtext == NULL)
 	        {
 		  fprintf (stderr, "Failed to convert UTF-8 to UCS-4.\n");
-		  return NULL;
+                  exit(1);
 		}
 
 	      len = g_utf8_strlen (para->text, para->length);
@@ -650,7 +650,7 @@ split_text_into_paragraphs (PangoContext
 		    {
 		      fprintf (stderr, "Failed to allocate a memory.\n");
 		      g_free (wtext);
-		      return NULL;
+                      exit(1);
 		    }
 		  for (i = 0; i < len; i++)
 		    {
@@ -665,7 +665,7 @@ split_text_into_paragraphs (PangoContext
 		  if (newtext == NULL)
 		    {
 		      fprintf (stderr, "Failed to convert UCS-4 to UTF-8.\n");
-		      return NULL;
+                      exit(1);
 		    }
 
 		  pango_layout_set_text (para->layout, newtext, -1);