org.macports.build for port ffmpeg returned: command execution failed

[alanl852@…]

XXX-MacBook-Pro:~ alanl852$ sudo port install opencv configure.compiler=llvm-gcc-4.2
--->  Computing dependencies for opencv
--->  Dependencies to be installed: ffmpeg ilmbase gsed jasper openexr
--->  Fetching archive for ffmpeg
--->  Attempting to fetch ffmpeg-0.7.13_0+mmx.darwin_12.x86_64.tbz2 from http://packages.macports.org/ffmpeg
--->  Fetching distfiles for ffmpeg
--->  Verifying checksum(s) for ffmpeg
--->  Extracting ffmpeg
--->  Applying patches to ffmpeg
--->  Configuring ffmpeg
--->  Building ffmpeg
Error: org.macports.build for port ffmpeg returned: command execution failed
Error: Failed to install ffmpeg
Please see the log file for port ffmpeg for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_ffmpeg/ffmpeg/main.log
Error: The following dependencies were not installed: ffmpeg ilmbase gsed jasper openexr
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
Error: Processing of port opencv failed

How do I solve this problem? I am on Mountain Lion, not sure if it makes the different. I am new Macports.

Thanks

[jmroot (Joshua Root)]

Why are you building with configure.compiler=llvm-gcc-4.2? The portfile specifically avoids using this compiler for a reason.