Fixed ports.

Change-Id: I9131c56d62ef254f67411a29245eb4e4041a645f
diff --git a/y2016/wpilib/BUILD b/y2016/wpilib/BUILD
index ff8722b..1571623 100644
--- a/y2016/wpilib/BUILD
+++ b/y2016/wpilib/BUILD
@@ -8,6 +8,7 @@
   deps = [
     '//aos/common:stl_mutex',
     '//aos/common/logging',
+    '//aos/common:math',
     '//aos/common/controls:control_loop',
     '//aos/common/util:log_interval',
     '//aos/common:time',