From 01ba84e4235fcfdaaeae3b32ee784a46d3cf2319 Mon Sep 17 00:00:00 2001
From: Matt Brubeck <mbrubeck@limpet.net>
Date: Thu, 5 Jan 2017 16:43:45 -0800
Subject: [PATCH] Use target-specific dependencies

---
 Cargo.toml | 12 ++++++++----
 src/lib.rs |  6 +++---
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 5d4730961..89b3e3c52 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,10 +15,6 @@ build = "build.rs"
 
 [dependencies]
 libc = "0.2"
-backtrace-sys = { path = "backtrace-sys", version = "0.1.3", optional = true }
-kernel32-sys = { version = "0.2", optional = true }
-winapi = { version = "0.2.5", optional = true }
-dbghelp-sys = { version = "0.2", optional = true }
 cfg-if = "0.1"
 rustc-demangle = "0.1"
 
@@ -26,6 +22,14 @@ rustc-demangle = "0.1"
 serde = { version = "0.8", optional = true }
 rustc-serialize = { version = "0.3", optional = true }
 
+[target.'cfg(windows)'.dependencies]
+dbghelp-sys = { version = "0.2", optional = true }
+kernel32-sys = { version = "0.2", optional = true }
+winapi = { version = "0.2.5", optional = true }
+
+[target.'cfg(all(unix, not(target_os = "emscripten"), not(target_os = "macos")))'.dependencies]
+backtrace-sys = { path = "backtrace-sys", version = "0.1.3", optional = true }
+
 [build-dependencies]
 serde_codegen = { version = "0.8", optional = true }
 
diff --git a/src/lib.rs b/src/lib.rs
index e69b56a7c..2b413c258 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -70,9 +70,9 @@
 #![deny(warnings)]
 
 extern crate libc;
-#[cfg(feature = "kernel32-sys")] extern crate kernel32;
-#[cfg(feature = "winapi")] extern crate winapi;
-#[cfg(feature = "dbghelp")] extern crate dbghelp;
+#[cfg(all(windows, feature = "kernel32-sys"))] extern crate kernel32;
+#[cfg(all(windows, feature = "winapi"))] extern crate winapi;
+#[cfg(all(windows, feature = "dbghelp"))] extern crate dbghelp;
 
 #[cfg(feature = "serde")]
 extern crate serde;