Fix rtemsconfig building.

I'll probably move to a more pythonic way of doing conf.py since this is getting
too complicated.

rtemsconfig/wscript

@@ -2,18 +2,32 @@ from sys import path
 from os.path import abspath
 path.append(abspath('../common/'))
 
+
 from waf import cmd_configure, cmd_build
 
+def options(ctx):
+	    ctx.add_option('--rtems-path-py', type='string', help="Path to py/ in RTEMS.")
+
 def configure(ctx):
+
+	if not ctx.options.rtems_path_py:
+		ctx.fatal("--rtems-path-py is required")
+
+	ctx.env.RTEMS_PATH = ctx.options.rtems_path_py
+
 	cmd_configure(ctx)
 
+
+
 def build(ctx):
+#	path.append(ctx.env.RTEMS_PATH)
 
 	sub = {
 		"VERSION":				"1.0",
 		"RELEASE":				"5.0.0",
 		"DOC":					"RTEMS Config",
 		"FILE_DOC":				"rtemsconfig",
+		"CONF_EXTRA":			"sys.path.append('%s')" % ctx.env.RTEMS_PATH
 	}
 
 	cmd_build(ctx, sub)