diff -r -u -p libppd-0.10.original/src/ppdfilt.c libppd-0.10/src/ppdfilt.c
--- libppd-0.10.original/src/ppdfilt.c	2001-11-05 22:22:42.000000000 +0100
+++ libppd-0.10/src/ppdfilt.c	2007-05-08 11:39:09.000000000 +0200
@@ -341,7 +341,7 @@ int main(int argc, char *argv[])
       {"help", no_argument, NULL, '?'},
       {0, 0, 0, 0}
     };
-    char *cur;
+    char *cur, *next;
     copies = 1;
     num_options = 0;
     options = NULL;
@@ -358,16 +358,27 @@ int main(int argc, char *argv[])
 	break;
       case 'o':
       case 'Z':
-	if ((cur = strchr(optarg, ':')) == NULL) {
-	  fprintf(stderr, "Bad option format: %s\n", optarg);
-	  exit(2);
-	}
-	*cur = 0;		// break the string
-	cur++;			// point cur to the value
-	/* MLP: skip past leading spaces. */
-	while (cur && (cur[0] == ' '))
-	  cur++;
-	num_options = cupsAddOption(optarg, cur, num_options, &options);
+	/* Ignore empty argument (to ease usage in magicfilter rules) */
+	if (optarg[0] == '\0')
+		break;
+	do {
+	  if ((cur = strchr(optarg, ':')) == NULL) {
+	    fprintf(stderr, "Bad option format: %s\n", optarg);
+	    exit(2);
+	  }
+	  *cur = 0;		// break the string
+	  cur++;		// point cur to the value
+	  /* MLP: skip past leading spaces. */
+	  while (cur && (cur[0] == ' '))
+	    cur++;
+	  /* allow comma seperated values to ease usage from LPRng */
+	  if ((next = strchr(cur, ',')) != NULL) {
+	    *next = 0;		// break the string
+	    next++;
+	  }
+	  num_options = cupsAddOption(optarg, cur, num_options, &options);
+	  optarg = next;
+	} while (next != NULL);
 	break;
       case 'p':
 	ppdfilename = optarg;