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The engine's dlopen of libkrunfw and mke2fs's of libarchive use bare sonames, and dyld reads DYLD_FALLBACK_LIBRARY_PATH once, at process startup — a setenv afterwards is invisible to it. When the variable is unset and the brew kegs exist, the CLI sets it and execv's itself: exec restarts dyld, which reads the variable fresh. Library consumers set the variable before their process starts instead (SPEC.md).