Adding a dependency for BUCK.

Change-Id: Icd5993fa607817f0777af0177af66292f1fb8f15
diff --git a/incubator/store/BUCK b/incubator/store/BUCK
index 59d6983..afc1908 100644
--- a/incubator/store/BUCK
+++ b/incubator/store/BUCK
@@ -5,9 +5,10 @@
 
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
+    '//lib:concurrent-trees',
     '//incubator/api:onos-incubator-api',
     '//core/store/dist:onos-core-dist',
-    '//core/store/serializers:onos-core-serializers',
+    '//core/store/serializers:onos-core-serializers'
 ]
 
 TEST_DEPS = [