Another attempt

.travis.yml

@@ -3,28 +3,24 @@ rust:
   - stable
   - beta
   - nightly
+os:
+  - linux
+  - osx
+  - windows
 jobs:
   allow_failures:
     - rust: nightly
     - env: TARGET=x86_64-pc-windows-gnu # Seems to cause problems
-  include:
-    - os: linux
-      env:
-        - RUST_BACKTRACE=1
-        - TARGET=x86_64-unknown-linux-gnu
-    - os: osx
-      env:
-        - RUST_BACKTRACE=1
-        - TARGET=x86_64-apple-darwin
-    - os: windows
-      env:
-        - RUST_BACKTRACE=1
-        - TARGET=x86_64-pc-windows-msvc
-    - os: windows
-      env:
-        - RUST_BACKTRACE=1
-        - TARGET=x86_64-pc-windows-gnu
 
+before_install:
+  - export RUST_BACKTRACE=1
+  - if [[ $TRAVIS_OS_NAME == "linux" ]]; then
+    export TARGET=x86_64-unknown-linux-gnu
+    elif [[ $TRAVIS_OS_NAME == "windows" ]]; then
+    export TARGET=x86_64-pc-windows-msvc
+    elif [[ $TRAVIS_OS_NAME == "osx" ]] then
+    export TARGET=x86_64-apple-darwin
+    fi
 before_script: rustup target add $TARGET
 script:
   - cargo build --release --target $TARGET