linux test

Author: daeho-ro

Formula/o/osrm-backend.rb

@@ -35,6 +35,10 @@ class OsrmBackend < Formula
   uses_from_macos "expat"
   uses_from_macos "zlib"
 
+  on_linux do
+    depends_on "llvm" => :build
+  end
+
   conflicts_with "flatbuffers", because: "both install flatbuffers headers"
   conflicts_with "mapnik", because: "both install Mapbox Variant headers"