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-rw-r--r--src/libstd/env.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libstd/env.rs b/src/libstd/env.rs
index 1968ca4b9e7..c052a69bc34 100644
--- a/src/libstd/env.rs
+++ b/src/libstd/env.rs
@@ -616,6 +616,9 @@ mod os {
 mod os {
     pub const FAMILY: &'static str = "unix";
     pub const OS: &'static str = "ios";
+    pub const DLL_PREFIX: &'static str = "lib";
+    pub const DLL_SUFFIX: &'static str = ".dylib";
+    pub const DLL_EXTENSION: &'static str = "dylib";
     pub const EXE_SUFFIX: &'static str = "";
     pub const EXE_EXTENSION: &'static str = "";
 }