Conditionalize Linux-specific commands in Travis.

.travis.yml

@@ -13,11 +13,11 @@ addons:
     - g++-4.8
 
 install:
-  - sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
-  - echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
-  - echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" | sudo tee -a /etc/apt/sources.list.d/mono-xamarin.list
-  - sudo apt-get update -qq
-  - sudo apt-get install -y mono-devel nuget p7zip-full
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF; fi
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list; fi
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" | sudo tee -a /etc/apt/sources.list.d/mono-xamarin.list; fi
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get update -qq; fi
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get install -y mono-devel nuget p7zip-full; fi
   - nuget install NUnit -Version 2.6.4 -OutputDirectory deps
   - nuget install NUnit.Runners -Version 2.6.4 -OutputDirectory deps
   - cp deps/NUnit.2.6.4/lib/nunit.framework.* deps/NUnit/