diff --git a/build.rs b/build.rs
index 0dd9656..a2c4431 100644
--- a/build.rs
+++ b/build.rs
@@ -1,16 +1,19 @@
 use serde_json::Value;
 use std::error::Error;
-use std::fs::File;
+use std::fs::{self, File};
 use std::io::{BufRead, BufReader, Write};
-
 use std::path::Path;
 
-fn write_version<'a>(f: &'a mut File, doc: &'a Value) -> Result<&'a str, Box<dyn Error>> {
-    let package_version = doc
-        .get("version")
-        .ok_or("No version found")?
-        .as_str()
-        .unwrap();
+
+fn package_version(json: &Value) -> Result<&str, Box<dyn Error>> {
+    json
+    .get("version")
+    .ok_or("No version found")?
+    .as_str()
+    .ok_or("Version is not a string".into())
+}
+
+fn write_version<'a>(f: &'a mut File, package_version: &'a str) -> Result<&'a str, Box<dyn Error>> {
     f.write_all(
         format!(
             "pub const PACKAGE_VERSION: &'static str = \"{}\";\n",
@@ -63,60 +66,49 @@ fn main() {
     let json: Value = include_str!("resources/rootasrole.json")
         .parse()
         .expect("Failed to parse rootasrole.json");
+    let package_version = package_version(&json).expect("Failed to get package version");
     let dest_path = std::path::Path::new("src").join("version.rs");
+    if dest_path.exists() && fs::read_to_string(&dest_path).unwrap().ends_with(&format!("\"{}\";\n",package_version)) {
+        return;
+    }
     let mut f = File::create(dest_path).unwrap();
     f.write_all(b"// This file is generated by build.rs\n")
         .unwrap();
     f.write_all(b"// Do not edit this file directly\n").unwrap();
     f.write_all(b"// Instead edit build.rs and run cargo build\n")
         .unwrap();
-    match write_version(&mut f, &json) {
-        Ok(package_version) => {
-            if let Err(err) = set_cargo_version(package_version, "Cargo.toml") {
-                eprintln!("cargo:warning={}", err);
-            }
-            //if folder capable/ exists
-            if Path::new("capable/capable").is_dir() {
-                if let Err(err) = set_cargo_version(package_version, "capable/capable/Cargo.toml") {
-                    eprintln!("cargo:warning={}", err);
-                }
-                if let Err(err) =
-                    set_cargo_version(package_version, "capable/capable-ebpf/Cargo.toml")
-                {
-                    eprintln!("cargo:warning={}", err);
-                }
-                if let Err(err) =
-                    set_cargo_version(package_version, "capable/capable-common/Cargo.toml")
-                {
-                    eprintln!("cargo:warning={}", err);
-                }
-            }
-            if Path::new("xtask").is_dir() {
-                if let Err(err) = set_cargo_version(package_version, "xtask/Cargo.toml") {
-                    eprintln!("cargo:warning={}", err);
-                }
-            }
-            if Path::new("rar-common").is_dir() {
-                if let Err(err) = set_cargo_version(package_version, "rar-common/Cargo.toml") {
-                    eprintln!("cargo:warning={}", err);
-                }
-            }
-            if let Err(err) = set_readme_version(package_version, "README.md") {
-                eprintln!("cargo:warning={}", err);
-            }
-            //if let Err(err) = set_pkgbuild_version(package_version, "PKGBUILD") {
-            //eprintln!("cargo:warning={}", err);
-            //}
+    write_version(&mut f, &package_version).expect("Failed to write version");
+    if let Err(err) = set_cargo_version(package_version, "Cargo.toml") {
+        eprintln!("cargo:warning={}", err);
+    }
+    //if folder capable/ exists
+    if Path::new("capable/capable").is_dir() {
+        if let Err(err) = set_cargo_version(package_version, "capable/capable/Cargo.toml") {
+            eprintln!("cargo:warning={}", err);
+        }
+        if let Err(err) =
+            set_cargo_version(package_version, "capable/capable-ebpf/Cargo.toml")
+        {
+            eprintln!("cargo:warning={}", err);
         }
-        Err(err) => {
+        if let Err(err) =
+            set_cargo_version(package_version, "capable/capable-common/Cargo.toml")
+        {
             eprintln!("cargo:warning={}", err);
         }
     }
-
-    // let xml = include_str!("resources/rootasrole.xml");
-    // if let Err(err) = write_dtd(&mut f, xml) {
-    //     eprintln!("cargo:warning={}", err);
-    // }
-
+    if Path::new("xtask").is_dir() {
+        if let Err(err) = set_cargo_version(package_version, "xtask/Cargo.toml") {
+            eprintln!("cargo:warning={}", err);
+        }
+    }
+    if Path::new("rar-common").is_dir() {
+        if let Err(err) = set_cargo_version(package_version, "rar-common/Cargo.toml") {
+            eprintln!("cargo:warning={}", err);
+        }
+    }
+    if let Err(err) = set_readme_version(package_version, "README.md") {
+        eprintln!("cargo:warning={}", err);
+    }
     f.flush().unwrap();
 }