Latest version of MacPorts & Xcode on a Mac Pro 2010 12-core running 
10.13, 64GB memory. After performing a normal selfupdate/upgrade outdated 
routine today I got a pile of "Error mapping file into memory" for various 
ports/libraries. I rolled back and rebooted then tried again and it installed. 
But I then tried to do a plain install of mpv and it got all the way through to 
scanning binaries for linking errors before show the same issue:

> --->  Cleaning mpv
> --->  Updating database of binaries
> --->  Updating database of C++ stdlib usage
> --->  Scanning binaries for linking errors
> Warning: Error parsing file /opt/local/bin/sndfile-cmp: Error mapping file 
> into memory
> Warning: Error parsing file /opt/local/bin/sndfile-concat: Error mapping file 
> into memory
> Warning: Error parsing file /opt/local/bin/sndfile-convert: Error mapping 
> file into memory
> Warning: Error parsing file /opt/local/bin/sndfile-deinterleave: Error 
> mapping file into memory
> Warning: Error parsing file /opt/local/bin/sndfile-info: Error mapping file 
> into memory
> Warning: Error parsing file /opt/local/bin/sndfile-interleave: Error mapping 
> file into memory
> Warning: Error parsing file /opt/local/bin/sndfile-metadata-get: Error 
> mapping file into memory
> Warning: Error parsing file /opt/local/bin/sndfile-metadata-set: Error 
> mapping file into memory
> Warning: Error parsing file /opt/local/bin/sndfile-play: Error mapping file 
> into memory
> Warning: Error parsing file /opt/local/bin/sndfile-salvage: Error mapping 
> file into memory
> Warning: Error parsing file /opt/local/lib/libsndfile.1.dylib: Error mapping 
> file into memory
> Warning: Error parsing file 
> /Applications/MacPorts/mpv.app/Contents/MacOS/mpv: Error mapping file into 
> memory
> Warning: Error parsing file /opt/local/bin/mpv: Error mapping file into memory
> --->  No broken files found.
> --->  No broken ports found.

        Does anyone know what might trigger these? It's the first time I've 
ever seen that warning, and there haven't been any system or xcode updates 
since the last successful installs/updates. I can't seem to find much info 
searching, and I haven't ever seen it on any other system running 10.13 or any 
previous version either. I plan to play around with it more tonight but if 
there is anything obvious I'm missing that could point me in a direction to 
start I'd appreciate it!

- Lee

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