ntop @3.3.10 port builds/installs error (No rule to make target `libtool.m4.in', needed by `acinclude.m4')

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Mac Book Pro 15-inch, Early 2011
Mac OS X Lion 10.7.3 (11D50)
XCode Version 4.3 (4E109)
MacPorts 2.0.4

{{ $ sudo port -d selfupdate The ports tree has been updated. To upgrade your installed ports, you should run

port upgrade outdated

$ sudo port outdated No installed ports are outdated.

$ sudo port install ntop Error: Target org.macports.build returned: shell command failed (see log for details) }}}

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Log for ntop

[ryandesign (Ryan Carsten Schmidt)]

This was not a clean build attempt. "sudo port clean ntop" and try again, and attach the new complete main.log if it fails again.