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-rw-r--r--src/bootstrap/builder.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index 62b5416cee8..755c532ab32 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -1760,7 +1760,8 @@ impl<'a> Builder<'a> {
             let needs_unstable_opts = target.contains("linux")
                 || target.contains("windows")
                 || target.contains("bsd")
-                || target.contains("dragonfly");
+                || target.contains("dragonfly")
+                || target.contains("illumos");
 
             if needs_unstable_opts {
                 rustflags.arg("-Zunstable-options");