Logs.error('''
Please use the version of waf that comes with Samba, not
a system installed version. See http://wiki.samba.org/index.php/Waf
-for details
+for details.
+
+Alternatively, please use ./autogen-waf.sh, and then
+run ./configure and make as usual. That will call the right version of waf.
''')
sys.exit(1)