adding flag for c
diff --git a/third_party/zookeeper/zookeeper.BUILD b/third_party/zookeeper/zookeeper.BUILD
index 79c42b3..008cb5b 100644
--- a/third_party/zookeeper/zookeeper.BUILD
+++ b/third_party/zookeeper/zookeeper.BUILD
@@ -25,6 +25,7 @@
"export INSTALL_DIR=$$(pwd)/$(@D)",
"export TMP_DIR=$$(mktemp -d -t zookeeper.XXXXX)",
"export CXXFLAGS=-Wno-error",
+ "export CFLAGS=-Wno-error",
"mkdir -p $$TMP_DIR",
"cp -R $$(pwd)/external/org_apache_zookeeper/* $$TMP_DIR",
"cd $$TMP_DIR/zookeeper-client/zookeeper-client-c",