Fix building without backtrace

diff --git a/src/libstd/sys/redox/mod.rs b/src/libstd/sys/redox/mod.rs
index d4811a3444fd3f768de0aab01355358dc0b1f6ba..a8dbac28fb655522566d87077487fb0d392cf073 100644 (file)
--- a/src/libstd/sys/redox/mod.rs
+++ b/src/libstd/sys/redox/mod.rs
@@ -13,6 +13,7 @@
 use io::{self, ErrorKind};
 
 pub mod args;
+#[cfg(any(not(cargobuild), feature = "backtrace"))]
 pub mod backtrace;
 pub mod condvar;
 pub mod env;