Update the FreeBSD documentation

CJDNS can be built (and works) with the clang compiler that is shipped with FreeBSD 10.
So update the documentation to use pkg to install gnu make and nodejs.

README.md

@@ -104,10 +104,9 @@ Select version gcc-4.8.1p2 or more recent.
 
 #### FreeBSD:
 
-The compiler expects GCC version 4.7, please install it from ports first.
+Everything you need is available prebuild in FreeBSD' ports. 
 
-    portsnap fetch extract
-    cd /usr/ports/lang/gcc47/ && make config && make install clean
+    pkg install gmake node
 
 ### 1. Retrieve cjdns from GitHub