add small shell script wrapping port from local sources

port.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+#
+# Simple shell script to invoke MacPorts from the source directory
+#
+
+BASEDIR=$(cd $(dirname "$0"); pwd)
+
+tclsh=$BASEDIR/vendor/tclsh
+port=$BASEDIR/src/port/port
+
+export TCLLIBPATH=$BASEDIR/src
+
+if [ ! -x "$tclsh" ]
+then
+    echo "please build MacPorts before running this script!" 1>&2
+    exit 1
+else
+    exec "$tclsh" "$port" "$@"
+fi