diff -Nur tar-1.23.orig/src/suffix.c tar-1.23/src/suffix.c
--- tar-1.23.orig/src/suffix.c	2010-03-09 06:52:41.000000000 -0600
+++ tar-1.23/src/suffix.c	2010-03-10 15:34:22.417696189 -0600
@@ -43,6 +43,7 @@
   { S(tlz,  LZMA) },
   { S(lzo,  LZOP) },
   { S(xz,   XZ) },
+  { S(txz, XZ) },
 #undef S
 #undef __CAT2__
 };