Merge pull request #281 from malcolmh/master

Add Macports to README.osx

README.osx

@@ -2,14 +2,20 @@ OSX Builds
 ----------
 
 To compile Hamlib on OSX you have to install autoconf, automake and libtool.
-The easiest way to install them is via the brew packet manager.
+The easiest way to install them is either via the brew package manager or macports..
 
-http://brew.sh
+Brew: https://brew.sh
 
 Once brew is installed, execute
 
 $ brew install automake autoconf libtool
 
+Macports: https://www.macports.org/install.php
+
+Once installed, execute
+
+$ sudo port install automake autoconf libtool
+
 Build
 -----