Add instructions to build on FreeBSD

README.md

@@ -39,6 +39,15 @@ The client depends on [readline library](http://cnswww.cns.cwru.edu/php/chet/rea
     
 Thanks to [@jfontan](https://github.com/vysheng/tg/issues/3#issuecomment-28293731) for this solution.
 
+#### FreeBSD
+
+Install these ports:
+* devel/libconfig
+* devel/libexecinfo
+
+    $ env CC=clang CFLAGS=-I/usr/local/include LDFLAGS=-L/usr/local/lib ./configure
+    $ make
+    
 #### Other UNIX
 
 If you manage to launch it on other UNIX, please let me know.