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use DYLD_FALLBACK_LIBRARY_PATH for dylib_path_envvar on macOS
When loading and linking a dynamic library or bundle, dlopen searches in LD_LIBRARY_PATH, DYLD_LIBRARY_PATH, PWD, and DYLD_FALLBACK_LIBRARY_PATH. In the Mach-O format, a dynamic library has an "install path." Clients linking against the library record this path, and the dynamic linker, dyld, uses it to locate the library. dyld searches DYLD_LIBRARY_PATH *before* the install path. dyld searches DYLD_FALLBACK_LIBRARY_PATH only if it cannot find the library in the install path. Setting DYLD_LIBRARY_PATH can easily have unintended consequences. See https://users.rust-lang.org/t/subprocess-and-dynamic-library-linking-problem-interaction/7873/10 See https://trac.macports.org/ticket/57692
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