build fix

diff --git a/Makefile b/Makefile
index abc89f0..d84e681 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -42,6 +42,7 @@ remote_run += echo running;
 remote_run +=  ./a.out /dev/selectmap1 fleet.bin
 
 runfpga: fleet.jar
+       mkdir -p build
        $(java) $(cp) $(interpreter_class) --dump-code
        $(java) $(cp) edu.berkeley.fleet.slipway.Client < build/fleet.bin