Add libc dependency

Cross compatible (with windows) exit failure code

Cargo.lock

@@ -112,9 +112,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.98"
+version = "0.2.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "320cfe77175da3a483efed4bc0adc1968ca050b098ce4f2f1c13a56626128790"
+checksum = "dd8f7255a17a627354f321ef0055d63b898c6fb27eff628af4d1b66b7331edf6"
 
 [[package]]
 name = "libz-sys"
@@ -155,6 +155,7 @@ dependencies = [
  "bzip2",
  "flate2",
  "lazy_static",
+ "libc",
  "rand",
  "strsim",
  "tar",

Cargo.toml

@@ -17,6 +17,7 @@ lazy_static = "1.4.0"
 walkdir     = "2.3.2"
 strsim      = "0.10.0"
 bzip2       = "0.4.3"
+libc        = "0.2.103"
 tar         = "0.4.37"
 xz2         = "0.1.6"
 zip         = { version =  "0.5.13", default-features = false, features = ["deflate-miniz"] }

src/lib.rs

@@ -21,7 +21,7 @@ pub use error::{Error, Result};
 
 use lazy_static::lazy_static;
 
-pub const EXIT_FAILURE: i32 = 127;
+pub const EXIT_FAILURE: i32 = libc::EXIT_FAILURE;
 
 const VERSION: &str = "0.1.6";