diff --git a/leaf/build.rs b/leaf/build.rs
index 15dd69756..8f1047cd9 100644
--- a/leaf/build.rs
+++ b/leaf/build.rs
@@ -29,11 +29,11 @@ fn generate_mobile_bindings() {
             let inc_path =
                 Path::new(String::from_utf8_lossy(&output.stdout).trim()).join("usr/include");
             format!("-I{}", inc_path.to_str().expect("invalid include path"))
-        } else if os == "android" {
-            let android_ndk_home = env::var("ANDROID_NDK_HOME").expect("ANDROID_NDK_HOME must be set");
+        } else if os == "android" && env::var("ANDROID_NDK_HOME").is_ok() {
+            let android_ndk_home = env::var("ANDROID_NDK_HOME").unwrap();
 
-            let host_os = std::env::consts::OS;
-            let host_arch = std::env::consts::ARCH;
+            let host_os = env::consts::OS;
+            let host_arch = env::consts::ARCH;
             let ndk_arch = format!("{}-{}", host_os, host_arch).to_lowercase();
 
             format!("-I{}/toolchains/llvm/prebuilt/{}/sysroot/usr/include", android_ndk_home, ndk_arch)
@@ -41,12 +41,12 @@ fn generate_mobile_bindings() {
             "".to_string()
         })
         // set the clang include path if android
-        .clang_arg(if os == "android" {
-            let android_ndk_home = env::var("ANDROID_NDK_HOME").expect("ANDROID_NDK_HOME must be set");
-            let clang_version = env::var("CLANG_VERSION").expect("CLANG_VERSION must be set");
+        .clang_arg(if os == "android" && env::var("ANDROID_NDK_HOME").is_ok() && env::var("CLANG_VERSION").is_ok() {
+            let android_ndk_home = env::var("ANDROID_NDK_HOME").unwrap();
+            let clang_version = env::var("CLANG_VERSION").unwrap();
 
-            let host_os = std::env::consts::OS;
-            let host_arch = std::env::consts::ARCH;
+            let host_os = env::consts::OS;
+            let host_arch = env::consts::ARCH;
             let ndk_arch = format!("{}-{}", host_os, host_arch).to_lowercase();
 
             format!("-I{}/toolchains/llvm/prebuilt/{}/lib/clang/{}/include", android_ndk_home, ndk_arch, clang_version)
@@ -67,11 +67,11 @@ fn main() {
     let os = env::var("CARGO_CFG_TARGET_OS").unwrap();
 
     // set wintun path env variable if windows
-    if std::env::var("CARGO_FEATURE_INBOUND_TUN").is_ok() && os == "windows" {
+    if env::var("CARGO_FEATURE_INBOUND_TUN").is_ok() && os == "windows" {
         use std::fs::File;
         use std::io::Write;
 
-        let arch = match std::env::consts::ARCH {
+        let arch = match env::consts::ARCH {
             "x86_64" => "amd64",
             "aarch64" => "arm64",
             "x86" => "x86",
@@ -89,8 +89,8 @@ fn main() {
     }
 
     // set clang lib env variable if android
-    if os == "android" {
-        let android_ndk_home = env::var("ANDROID_NDK_HOME").expect("ANDROID_NDK_HOME must be set");
+    if os == "android" && env::var("ANDROID_NDK_HOME").is_ok() {
+        let android_ndk_home = env::var("ANDROID_NDK_HOME").unwrap();
 
         let host_os = std::env::consts::OS;
         let host_arch = std::env::consts::ARCH;