Declare build script dependency on env variable

Resolves #275.
time-rs · Sep 11, 2020 · 28094d6 · 28094d6
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,13 @@ Versioning].
 
 ---
 
+## Unreleased
+
+### Fixed
+
+- The build script now declares a dependency on the `COMPILING_UNDER_CARGO_WEB`
+  environment variable.
+
 ## 0.2.18 [2020-09-08]
 
 ### Changed

diff --git a/build.rs b/build.rs
@@ -17,6 +17,8 @@ macro_rules! warning {
 }
 
 fn main() {
+    println!("cargo:rerun-if-env-changed=COMPILING_UNDER_CARGO_WEB");
+
     // Are we compiling with `cargo web`?
     if env::var("COMPILING_UNDER_CARGO_WEB") == Ok("1".into()) {
         cfg_emit!(__time_02_cargo_web);