+# specify the rti13 location
+AC_ARG_WITH(rti13, [ --with-rti13=PREFIX Specify the prefix path to a HLA13 rti])
+
+if test "x$with_rti13" != "x" ; then
+ echo "rti13 prefix is $with_rti13"
+ EXTRA_DIRS="${EXTRA_DIRS} $with_rti13"
+fi
+
+# specify the rti13 location
+AC_ARG_WITH(rti1516, [ --with-rti1516=PREFIX Specify the prefix path to a HLA1516 rti])
+
+if test "x$with_rti1516" != "x" ; then
+ echo "rti1516 prefix is $with_rti1516"
+ EXTRA_DIRS="${EXTRA_DIRS} $with_rti1516"
+fi
+