From 343ecc8fe6a1239785228ec1b8b128249814670a Mon Sep 17 00:00:00 2001
From: Paul Cody Johnston <pcj@pubref.org>
Date: Wed, 26 Oct 2016 07:11:40 -0600
Subject: [PATCH] Hard fail when operating system is unknown. (#31)

---
 dotnet/csharp.bzl | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/dotnet/csharp.bzl b/dotnet/csharp.bzl
index fa5d9fd40f0919..9700bd9d4bd5dc 100644
--- a/dotnet/csharp.bzl
+++ b/dotnet/csharp.bzl
@@ -553,8 +553,7 @@ def _mono_repository_impl(repository_ctx):
   elif repository_ctx.os.name.find("mac") != -1:
     _mono_osx_repository_impl(repository_ctx)
   else:
-    #if nothing else works look for a local version of mono
-    _csharp_autoconf(repository_ctx)
+    fail("Unsupported operating system: %s" % repository_ctx.os.name)
 
 mono_package = repository_rule(
   implementation = _mono_repository_impl,