On macOS High Sierra, Version 10.13.6, I used Apple's Clang – Apple LLVM version 10.0.0 (clang-1000.11.45.5) / Target: x86_64-apple-darwin17.7.0 / Thread model: posix – to compile. Deepdir produces an Exit code of 12 and leaves no directory tree behind. It must performed something, because the working directory's date (ls -d .) is newer than at the time deepdir was compiled.
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Pete <\
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