Updated Compile and install on macOS using macports (markdown)

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

@@ -22,6 +22,12 @@ Install create-dmg:
     sudo port -N install npm7
     sudo npm install --global create-dmg
 
+Set environment variables:
+
+    export GIO_EXTRA_MODULES=/opt/local/lib/gio/modules
+    export GST_PLUGIN_SCANNER=/opt/local/libexec/gstreamer-1.0/gst-plugin-scanner
+    export GST_PLUGIN_PATH=/opt/local/lib/gstreamer-1.0
+
 Get code, compile and create DMG:
 
     git clone https://github.com/strawberrymusicplayer/strawberry