Sure for ppc64.

diff --git a/bin/runtest-m64 b/bin/runtest-m64
new file mode 100755 (executable)
index 0000000..453cf06
--- /dev/null
+++ b/bin/runtest-m64
@@ -0,0 +1,2 @@
+#! /bin/sh
+exec runtest --target_board unix/-m64 "$@"