Index: file.c
===================================================================
--- file.c	(revision 20650)
+++ file.c	(revision 20651)
@@ -409,6 +409,7 @@
 static void WritePCBNetlistPatchData(FILE * FP)
 {
 	if (PCB->NetlistPatches != NULL) {
+		pcb_io_incompat_save(PCB->Data, NULL, "Saving netlist patch makes the file incompatible with geda/pcb.", "Either remove (or resolve) your netlist patches before save or remove the NetListPatch() subtree manually from the saved file before using with geda/pcb.");
 		fprintf(FP, "NetListPatch()\n(\n");
 		pcb_ratspatch_fexport(PCB, FP, 1);
 		fprintf(FP, ")\n");