message: Only run shell tput in *Unix
diff: @@ -26,11 +26,14 @@ ifneq (, $(findstring nightly,$(RUST_VERSION)))
  backends += singlepass
  endif
  +ifneq ($(OS), Windows_NT)
  bold := $(shell tput bold)
  green := $(shell tput setaf 2)
  reset := $(shell tput sgr0)
  +endif
  +
  -$(info Available backends for this host: $(bold)$(green)${backends}$(reset))
  +$(info Available backends: $(bold)$(green)${backends}$(reset))
  backend_features_spaced := $(foreach backend,$(backends),backend-$(backend))
  backend_features := --features "$(backend_features_spaced)"
  