invalid command "vercmp" on Mac OS X Lion installing mpeg port

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I keep getting this error - Error: Unable to open port: invalid command name "vercmp" when I try to install ffmpeg (sudo port install ffmpeg) or if I try to upgrade this libsdl (sudo port upgrade libsdl)

I have updated to latest ports doing (sudo port selfupdate) followed by a (sudo port upgrade outdated) and even ran (sudo port sync)

OS I'm using is Mac OS X Lion and installed using trunk base when Lion was still very new .. Any help, please.

Thanks!