exe/benchmark_driver in benchmark_driver-0.2.3 vs exe/benchmark_driver in benchmark_driver-0.2.4

@@ -14,10 +14,12 @@
       options[:execs] << path
     end
   end
   o.on('-r', '--rbenv [VERSION]', 'Ruby executable in rbenv') do |r|
     options[:execs] ||= []
-    options[:execs] << "#{r}::RBENV_VERSION='#{r}' ruby"
+    r.split(/;/).each do |version|
+      options[:execs] << "#{version}::#{`RBENV_VERSION='#{version}' rbenv which ruby`.rstrip}"
+    end
   end
   o.on('-i [DURATION]', '--ips [SECONDS]', "Measure IPS in duration seconds (default: #{BenchmarkDriver::DEFAULT_IPS_DURATION})") do |i|
     options[:measure_type] = 'ips'
     options[:measure_num]  = Integer(i) if i
   end