diff -u rnv-1.7.8/dxl.h rnv-1.7.8-modified/dxl.h
--- rnv-1.7.8/dxl.h	2006-11-02 17:54:08.000000000 +0900
+++ rnv-1.7.8-modified/dxl.h	2009-08-03 18:07:00.000000000 +0900
@@ -7,7 +7,9 @@
 #define DXL_EXC 0
 #endif
 
+#ifndef DXL_URL
 #define DXL_URL "http://davidashen.net/relaxng/pluggable-datatypes"
+#endif
 
 extern char *dxl_cmd;
 
diff -u rnv-1.7.8/Makefile rnv-1.7.8-modified/Makefile
--- rnv-1.7.8/Makefile	2006-11-02 17:54:08.000000000 +0900
+++ rnv-1.7.8-modified/Makefile	2009-08-03 17:40:39.000000000 +0900
@@ -46,6 +46,10 @@
 DEF+=-DDXL_EXC=${DXL_EXC}
 endif
 
+ifneq (${DXL_URL},)
+DEF+=-DDXL_URL=${DXL_URL}
+endif
+
 LIBRNVA=librnv.a
 LIBRNVSO=librnv.so
 LIBRNV=${LIBRNVA}