/usr/bin/gui-compare is in mono-tools-gui 4.2-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
export DYLD_FALLBACK_LIBRARY_PATH=/Library/Frameworks/Mono.framework/Versions/Current/lib:/usr/lib
exec mono $MONO_OPTIONS "/usr/lib/gui-compare/gui-compare.exe" "$@"
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