diff --git a/build.rs b/build.rs
index 1e6e41c5..65ce304d 100644
--- a/build.rs
+++ b/build.rs
@@ -48,7 +48,6 @@ fn has_feature(feature: &str) -> bool {
 fn can_compile<T: AsRef<str>>(test: T) -> bool {
     use std::process::Stdio;
 
-    let out_dir = var("OUT_DIR").unwrap();
     let rustc = var("RUSTC").unwrap();
     let target = var("TARGET").unwrap();
 
@@ -72,8 +71,9 @@ fn can_compile<T: AsRef<str>>(test: T) -> bool {
         .arg("--emit=metadata") // Do as little as possible but still parse.
         .arg("--target")
         .arg(target)
-        .arg("--out-dir")
-        .arg(out_dir); // Put the output somewhere inconsequential.
+        .arg("-o")
+        .arg("-")
+        .stdout(Stdio::null()); // We don't care about the output (only whether it builds or not)
 
     // If Cargo wants to set RUSTFLAGS, use that.
     if let Ok(rustflags) = var("CARGO_ENCODED_RUSTFLAGS") {
diff --git a/cap-async-std/build.rs b/cap-async-std/build.rs
index 3706ce13..434559ec 100644
--- a/cap-async-std/build.rs
+++ b/cap-async-std/build.rs
@@ -35,7 +35,6 @@ fn has_feature(feature: &str) -> bool {
 fn can_compile<T: AsRef<str>>(test: T) -> bool {
     use std::process::Stdio;
 
-    let out_dir = var("OUT_DIR").unwrap();
     let rustc = var("RUSTC").unwrap();
     let target = var("TARGET").unwrap();
 
@@ -59,8 +58,9 @@ fn can_compile<T: AsRef<str>>(test: T) -> bool {
         .arg("--emit=metadata") // Do as little as possible but still parse.
         .arg("--target")
         .arg(target)
-        .arg("--out-dir")
-        .arg(out_dir); // Put the output somewhere inconsequential.
+        .arg("-o")
+        .arg("-")
+        .stdout(Stdio::null()); // We don't care about the output (only whether it builds or not)
 
     // If Cargo wants to set RUSTFLAGS, use that.
     if let Ok(rustflags) = var("CARGO_ENCODED_RUSTFLAGS") {
diff --git a/cap-fs-ext/build.rs b/cap-fs-ext/build.rs
index b8ccb4dd..1716d753 100644
--- a/cap-fs-ext/build.rs
+++ b/cap-fs-ext/build.rs
@@ -32,7 +32,6 @@ fn has_feature(feature: &str) -> bool {
 fn can_compile<T: AsRef<str>>(test: T) -> bool {
     use std::process::Stdio;
 
-    let out_dir = var("OUT_DIR").unwrap();
     let rustc = var("RUSTC").unwrap();
     let target = var("TARGET").unwrap();
 
@@ -56,8 +55,9 @@ fn can_compile<T: AsRef<str>>(test: T) -> bool {
         .arg("--emit=metadata") // Do as little as possible but still parse.
         .arg("--target")
         .arg(target)
-        .arg("--out-dir")
-        .arg(out_dir); // Put the output somewhere inconsequential.
+        .arg("-o")
+        .arg("-")
+        .stdout(Stdio::null()); // We don't care about the output (only whether it builds or not)
 
     // If Cargo wants to set RUSTFLAGS, use that.
     if let Ok(rustflags) = var("CARGO_ENCODED_RUSTFLAGS") {
diff --git a/cap-primitives/build.rs b/cap-primitives/build.rs
index b92c0bce..8bab65a3 100644
--- a/cap-primitives/build.rs
+++ b/cap-primitives/build.rs
@@ -42,7 +42,6 @@ fn has_feature(feature: &str) -> bool {
 fn can_compile<T: AsRef<str>>(test: T) -> bool {
     use std::process::Stdio;
 
-    let out_dir = var("OUT_DIR").unwrap();
     let rustc = var("RUSTC").unwrap();
     let target = var("TARGET").unwrap();
 
@@ -66,8 +65,9 @@ fn can_compile<T: AsRef<str>>(test: T) -> bool {
         .arg("--emit=metadata") // Do as little as possible but still parse.
         .arg("--target")
         .arg(target)
-        .arg("--out-dir")
-        .arg(out_dir); // Put the output somewhere inconsequential.
+        .arg("-o")
+        .arg("-")
+        .stdout(Stdio::null()); // We don't care about the output (only whether it builds or not)
 
     // If Cargo wants to set RUSTFLAGS, use that.
     if let Ok(rustflags) = var("CARGO_ENCODED_RUSTFLAGS") {
diff --git a/cap-std/build.rs b/cap-std/build.rs
index 0004c698..f3afe13c 100644
--- a/cap-std/build.rs
+++ b/cap-std/build.rs
@@ -37,7 +37,6 @@ fn has_feature(feature: &str) -> bool {
 fn can_compile<T: AsRef<str>>(test: T) -> bool {
     use std::process::Stdio;
 
-    let out_dir = var("OUT_DIR").unwrap();
     let rustc = var("RUSTC").unwrap();
     let target = var("TARGET").unwrap();
 
@@ -61,8 +60,9 @@ fn can_compile<T: AsRef<str>>(test: T) -> bool {
         .arg("--emit=metadata") // Do as little as possible but still parse.
         .arg("--target")
         .arg(target)
-        .arg("--out-dir")
-        .arg(out_dir); // Put the output somewhere inconsequential.
+        .arg("-o")
+        .arg("-")
+        .stdout(Stdio::null()); // We don't care about the output (only whether it builds or not)
 
     // If Cargo wants to set RUSTFLAGS, use that.
     if let Ok(rustflags) = var("CARGO_ENCODED_RUSTFLAGS") {