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-rw-r--r--src/rustc/driver/driver.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/rustc/driver/driver.rs b/src/rustc/driver/driver.rs
index 1abc36a075f..672a950f42b 100644
--- a/src/rustc/driver/driver.rs
+++ b/src/rustc/driver/driver.rs
@@ -49,6 +49,7 @@ fn default_configuration(sess: session, argv0: str, input: input) ->
     };
 
     ret [ // Target bindings.
+         attr::mk_word_item(os::family()),
          mk("target_os", os::sysname()),
          mk("target_family", os::family()),
          mk("target_arch", arch),