Updated Compile and install on macOS using macports (markdown)

Compile-and-install-on-macOS-using-macports.md

@@ -19,9 +19,12 @@ Install dependencies through port:
 
 Install create-dmg:
 
-    wget https://raw.githubusercontent.com/create-dmg/create-dmg/master/create-dmg
+    git clone https://github.com/create-dmg/create-dmg
+    cd create-dmg
     chmod u+x create-dmg
-    sudo mv create-dmg /opt/local/bin/
+    sudo cp create-dmg /opt/local/bin/
+    mkdir -p /opt/local/share/create-dmg
+    cp -r support /opt/local/share/create-dmg/
 
 Set environment variables: