os x lion macport problem

I'm trying to install tomcat6 on OS X Lion using via macpor开发者_开发技巧t 2.0. However, there is problem during the installation of one of the dependencies "commons-dbcp"

The messages are as follows

--->  Building commons-dbcp
Error: Target org.macports.build returned: shell command failed (see log for details)
Error: Failed to install commons-dbcp

After upgrading my OS to Lion, this kind of problem with macport happens alot and I don't know how to fix. It stopped me from installing a number of packages which I could install without a problem on Snow leopard.

Anyone could help me on this? Thanks

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Make sure you have XCode 4.1+ installed and then update (re-install) your MacPorts to version 2.0.0 more instruction available here.

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I faced similar problem, As pointed by Shayanlinux, installing XCode 4.1+ and running a sudo port selfupdate fixed the problem.