solana-install design proposal

install/build.rs

@@ -0,0 +1,15 @@
+use std::time::SystemTime;
+
+fn main() {
+    println!(
+        "cargo:rustc-env=TARGET={}",
+        std::env::var("TARGET").unwrap()
+    );
+    println!(
+        "cargo:rustc-env=BUILD_SECONDS_SINCE_UNIX_EPOCH={}",
+        SystemTime::now()
+            .duration_since(SystemTime::UNIX_EPOCH)
+            .unwrap()
+            .as_secs(),
+    );
+}