Require os setting

conanfile.py

@@ -6,7 +6,7 @@ class CreatureLibConan(ConanFile):
     license = "TODO"
     url = "https://git.p-epsilon.com/Deukhoofd/CreatureLib"
     description = "The core implementation for turn based battling using creatures."
-    settings = "compiler"
+    settings = "os", "compiler"
     options = {"shared": [True, False]}
     default_options = {"shared": True}
     generators = "cmake"