Bring back eventfd behind a feature flag

At some point, feature flags will be switched to a conditional build system.

1 files changed, 4 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index f1c13d57..64b7bd46 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,10 @@ exclude     = [
   "test/**/*"
 ]
 
+[features]
+
+eventfd = []
+
 [dependencies]
 libc     = "0.1.4"
 bitflags = "0.1.1"