Rebuild if XCLIP_PATH or XSEL_PATH environment variable is changed

Cargo.toml

@@ -22,6 +22,7 @@ exclude = [
     "res/*",
 ]
 edition = "2018"
+build = "build.rs"
 
 [package.metadata.deb]
 section = "utility"

build.rs

@@ -0,0 +1,8 @@
+fn main() {
+    // xclip and xsel paths are inserted at compile time on Linux
+    #[cfg(target_os = "linux")]
+    {
+        println!("cargo:rerun-if-env-changed=XCLIP_PATH");
+        println!("cargo:rerun-if-env-changed=XSEL_PATH");
+    }
+}