nixpkgs/pkgs/stdenv/darwin/portable-libsystem.sh

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# Make /nix/store/...-libSystem “portable” for static built binaries.
# This just rewrites everything in $1/bin to use the
# /usr/lib/libSystem.B.dylib that is provided on every macOS system.
fixupOutputHooks+=('fixLibsystemRefs $prefix')
fixLibsystemRefs() {
if [ -d "$1/bin" ]; then
find "$1/bin" -type f -exec \
@targetPrefix@install_name_tool -change @libsystem@ /usr/lib/libSystem.B.dylib {} \;
fi
}