+# The user has not set any verbosity, default to quiet mode and inform the
+# user how to enable verbose compiles.
+ifeq ($(V),)
+quiet_DOC := "Use \"$(MAKE) V=1\" to see the verbose compile lines.\n"
+quiet = @echo $(quiet_DOC)$(eval quiet_DOC:=)" $1 $@"; $($1)
+endif
+# The user has explicitly enabled quiet compilation.
+ifeq ($(V),0)
+quiet = @echo " $1 $@"; $($1)
+endif
+# Otherwise, print the full command line.
+quiet ?= $($1)
+