无法在OS X上安装没有sudo的流浪汉插件

我以前在流浪汉中安装了插件。现在，在另一台MacBook上，我试图安装一些与旧MacBook上使用的相同的插件。

例如，当我尝试安装vagrant-hostmanager时，出现红宝石权限错误：

$ vagrant plugin install vagrant-hostmanager
Installing the 'vagrant-hostmanager' plugin. This can take a few minutes...
Bundler, the underlying system Vagrant uses to install plugins,
reported an error. The error is shown below. These errors are usually
caused by misconfigured plugin installations or transient network
issues. The error from Bundler is:

An error occurred while installing ffi (1.9.8), and Bundler cannot continue.
Make sure that `gem install ffi -v '1.9.8'` succeeds before bundling.

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /opt/vagrant/embedded/bin/ruby extconf.rb
checking for ffi.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/opt/vagrant/embedded/bin/ruby
    --with-ffi_c-dir
    --without-ffi_c-dir
    --with-ffi_c-include
    --without-ffi_c-include=${ffi_c-dir}/include
    --with-ffi_c-lib
    --without-ffi_c-lib=${ffi_c-dir}/
    --with-libffi-config
    --without-libffi-config
    --with-pkg-config
    --without-pkg-config
/opt/vagrant/embedded/lib/ruby/2.0.0/tmpdir.rb:92:in `mktmpdir': parent directory is world writable but not sticky (ArgumentError)
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:510:in `try_link0'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:534:in `try_link'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:427:in `have_devel?'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:433:in `try_do'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:549:in `block in try_compile'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:502:in `with_werror'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:549:in `try_compile'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:1044:in `block in have_header'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:895:in `block in checking_for'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:340:in `block (2 levels) in postpone'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:310:in `open'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:340:in `block in postpone'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:310:in `open'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:336:in `postpone'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:894:in `checking_for'
    from /opt/vagrant/embedded/lib/ruby/2.0.0/mkmf.rb:1043:in `have_header'
    from extconf.rb:16:in `<main>'


Gem files will remain installed in /Volumes/Passport/vagrant.d/gems/gems/ffi-1.9.8 for inspection.
Results logged to /Volumes/Passport/vagrant.d/gems/gems/ffi-1.9.8/ext/ffi_c/gem_make.out

与众不同的一件事是，由于我在本地SSD上空间有限，因此在.bashrc中定义了以下内容：

export VAGRANT_HOME=/Volumes/Passport/vagrant.d

因此，我的盒子文件存储在2TB USB3驱动器上，而不是浪费宝贵的SSD空间。

现在，我可以使用sudo执行插件安装，但这成为一个级联的问题，因为vagrant up如果不这样做，现在将无法在Vagrantfile中看到该插件sudo vagrant up。然后虚拟机由root拥有...您可以看到它是如何失控地级联的。

有人知道怎么了吗？我该如何解决？

编辑：我发现，如果将其更改VAGRANT_HOME为默认值~/.vagrant.d，则可以安装该插件-但是，我的盒子现在位于默认设置无法访问的卷上。显然，这是Ruby的局限性。

TIA！