Index: ctrlc/Cargo.toml
===================================================================
--- ctrlc.orig/Cargo.toml
+++ ctrlc/Cargo.toml
@@ -73,7 +73,7 @@ version = "0.3"
 version = "0.2"
 
 [target."cfg(unix)".dependencies.nix]
-version = "0.30"
+version = ">= 0.29, < 0.31"
 features = ["signal"]
 default-features = false