VXL fails to build with CMake on Mac OS 10.6

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VXL fails with a message about a missing library. Web searching reveals that others have encounter a similar problem with other software. The common factor seems to be CMake. The message is:

CMake Error: The following variables are used in this project, but they are set to NOTFOUND. Please set them or make sure they are set and tested correctly in the CMake files: MPEG2_vo_LIBRARY (ADVANCED)

linked by target "vidl" in directory /opt/local/var/macports/build/_private_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_vxl/work/vxl-1.12.0/core/vidl linked by target "vidl_vil1" in directory /opt/local/var/macports/build/_private_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_vxl/work/vxl-1.12.0/core/vidl_vil1 linked by target "oxp" in directory /opt/local/var/macports/build/_private_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_vxl/work/vxl-1.12.0/contrib/oxl/oxp linked by target "glmovie" in directory /opt/local/var/macports/build/_private_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_vxl/work/vxl-1.12.0/contrib/oxl/apps/glmovie linked by target "vobgetframe" in directory /opt/local/var/macports/build/_private_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_vxl/work/vxl-1.12.0/contrib/oxl/apps/glmovie

-- Configuring incomplete, errors occurred!

Error: Status 1 encountered during processing.

I've attached a file containing the output with the -d flag.

I have no idea how to fix this. Can anyone help? Any suggestions would be much appreciated.

I previously installed vxl on 10.5 (using Macports) and everything worked fine. I get the same error if I try to build from source code under 10.6.