diff --git a/lmdb-sys/Cargo.toml b/lmdb-sys/Cargo.toml
index fc35cf4..179385b 100644
--- a/lmdb-sys/Cargo.toml
+++ b/lmdb-sys/Cargo.toml
@@ -15,8 +15,9 @@ name = "lmdb-sys"
 [build-dependencies.rust-bindgen]
 git = "https://github.com/crabtw/rust-bindgen.git"
 
-[build-dependencies.pkg-config]
+[build-dependencies]
 pkg-config = "*"
-
-[build-dependencies.gcc]
 gcc = "*"
+
+[dependencies]
+bitflags = "*"
diff --git a/lmdb-sys/src/lib.rs b/lmdb-sys/src/lib.rs
index 226ba95..7ba731a 100644
--- a/lmdb-sys/src/lib.rs
+++ b/lmdb-sys/src/lib.rs
@@ -6,10 +6,14 @@
     raw_pointer_derive,
     unstable,
    )]
+
 #![feature(plugin)]
 
 extern crate libc;
 
+#[macro_use]
+extern crate bitflags;
+
 pub use constants::*;
 
 mod constants;