Index: test/all.test
==================================================================
--- test/all.test
+++ test/all.test
@@ -14,11 +14,11 @@
 set testdir [file dirname $argv0]
 source $testdir/permutations.test
 
 run_test_suite full
 
-run_test_suite rbu
+ifcapable rbu { run_test_suite rbu }
 run_test_suite no_optimization 
 run_test_suite memsubsys1 
 run_test_suite memsubsys2 
 run_test_suite singlethread 
 run_test_suite multithread