Preliminary changes to add FreeBSD support to direwolf

Author: DianeBruce

Makefile

@@ -2,15 +2,18 @@
 # The Windows version is built with the help of Cygwin. 
 
 # In my case, I see CYGWIN_NT-6.1-WOW so we don't check for 
-# equal to some value.   Your mileage my vary.
+# equal to some value.   Your mileage may vary.
 
 win := $(shell uname | grep CYGWIN)
 dar := $(shell uname | grep Darwin)
+free := $(shell uname | grep FreeBSD)
 
 ifneq ($(win),)
    include Makefile.win
 else ifeq ($(dar),Darwin)
    include Makefile.macosx
+else ifeq ($(free),FreeBSD)
+   include Makefile.FreeBSD
 else
    include Makefile.linux
 endif