removed unnecessary strings

build.rs

@@ -28,19 +28,16 @@
  */ 
 
 use std::{
-	io::{ self, Write },
+	io::{ Error, Write },
 	process::{ Command, exit, Stdio },
 	path::PathBuf,
 };
 
 use bindgen::{ Builder, CargoCallbacks, MacroTypeVariation };
 
-fn main() -> Result<(), io::Error> {
+fn main() -> Result<(), Error> {
 	let mut header = String::new();
 
-	/* bindgen has a dependency on clang for now */
-	Command::new("clang").spawn().expect("Missing dependency: clang");
-	
 	/* Locate sysexits.h using cpp(1) */
 	let mut process = Command::new("cpp")
 		.arg("-M")
@@ -54,8 +51,8 @@ fn main() -> Result<(), io::Error> {
 
 	let output = process.wait_with_output()?.stdout;
 
-	let headers = String::from_utf8(output).unwrap_or_else( |_| {
-		eprintln!("Output from cpp(1) is invalid UTF-8.");
+	let headers = String::from_utf8(output).unwrap_or_else( |e| {
+		Error::other(e.to_string());
 		/* Exit with status 1 because we’re bootstrapping sysexits.h, silly! */
 		exit(1); 
 	});

src/lib.rs

@@ -0,0 +1,21 @@
+/* automatically generated by rust-bindgen 0.69.4 */
+
+pub const _SYSEXITS_H: i32 = 1;
+pub const EX_OK: i32 = 0;
+pub const EX__BASE: i32 = 64;
+pub const EX_USAGE: i32 = 64;
+pub const EX_DATAERR: i32 = 65;
+pub const EX_NOINPUT: i32 = 66;
+pub const EX_NOUSER: i32 = 67;
+pub const EX_NOHOST: i32 = 68;
+pub const EX_UNAVAILABLE: i32 = 69;
+pub const EX_SOFTWARE: i32 = 70;
+pub const EX_OSERR: i32 = 71;
+pub const EX_OSFILE: i32 = 72;
+pub const EX_CANTCREAT: i32 = 73;
+pub const EX_IOERR: i32 = 74;
+pub const EX_TEMPFAIL: i32 = 75;
+pub const EX_PROTOCOL: i32 = 76;
+pub const EX_NOPERM: i32 = 77;
+pub const EX_CONFIG: i32 = 78;
+pub const EX__MAX: i32 = 78;