--- misc/liblangtag-0.2/liblangtag/lt-xml.c	2012-02-02 09:54:51.000000000 +0100
+++ misc/build/liblangtag-0.2/liblangtag/lt-xml.c	2012-06-04 17:39:32.010299830 +0200
@@ -45,6 +45,14 @@
 
 G_LOCK_DEFINE_STATIC (lt_xml);
 
+static const char* get_datadir()
+{
+    const char* pEnv = getenv( "LIBO_LANGTAG_DATADIR");
+    if (pEnv && *pEnv)
+        return pEnv;
+    return REGDATADIR;
+}
+
 /*< private >*/
 static gboolean
 lt_xml_read_subtag_registry(lt_xml_t  *xml,
@@ -62,7 +70,7 @@
 	if (!g_file_test(regfile, G_FILE_TEST_EXISTS)) {
 		g_free(regfile);
 #endif
-	regfile = g_build_filename(REGDATADIR, "language-subtag-registry.xml", NULL);
+	regfile = g_build_filename(get_datadir(), "language-subtag-registry.xml", NULL);
 #ifdef GNOME_ENABLE_DEBUG
 	}
 #endif
@@ -120,7 +128,7 @@
 	if (!g_file_test(regfile, G_FILE_TEST_EXISTS)) {
 		g_free(regfile);
 #endif
-	regfile = g_build_filename(REGDATADIR, "common", "bcp47", filename, NULL);
+	regfile = g_build_filename(get_datadir(), "common", "bcp47", filename, NULL);
 #ifdef GNOME_ENABLE_DEBUG
 	}
 #endif