Add a missing link in the book for `jobserver`. I don't know what the original

intended link destination was, so I chose to link to the GNU Make documentation.

diff --git a/src/doc/src/reference/environment-variables.md b/src/doc/src/reference/environment-variables.md
index ebe3edf6b4d8ad9bb834966585f47f8331b65ac9..b5f81e2d224a34e98b82840e43574b6b710e9959 100644 (file)
--- a/src/doc/src/reference/environment-variables.md
+++ b/src/doc/src/reference/environment-variables.md
@@ -125,7 +125,8 @@ let out_dir = env::var("OUT_DIR").unwrap();
 [links]: reference/build-scripts.html#the-links-manifest-key
 [profile]: reference/manifest.html#the-profile-sections
 [configuration]: https://doc.rust-lang.org/reference/attributes.html#conditional-compilation
-[clang]:http://clang.llvm.org/docs/CrossCompilation.html#target-triple
+[clang]: http://clang.llvm.org/docs/CrossCompilation.html#target-triple
+[jobserver]: https://www.gnu.org/software/make/manual/html_node/Job-Slots.html
 
 ### Environment variables Cargo sets for 3rd party subcommands