Win7 64b - Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

[7heo]

$ vagrant plugin install vagrant-unison Installing the 'vagrant-unison' 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 json (1.8.2), and Bundler cannot continue. Make sure that gem install json -v '1.8.2' succeeds before bundling.

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

"c:/Program Files (x86)/HashiCorp/Vagrant/embedded/bin/ruby.exe" extconf.rb

creating Makefile

make "DESTDIR=" generating generator-i386-mingw32.def /bin/sh: -c: line 0: syntax error near unexpected token x86' /bin/sh: -c: line 0:/c/Program\ Files\ (x86)/HashiCorp/Vagrant/embedded/bin/ruby -e "puts 'EXPORTS', 'Init_generator'" > generator-i386-mingw32.def' make: *** [generator-i386-mingw32.def] Error 2

Gem files will remain installed in C:/Users/User/.vagrant.d/gems/gems/json-1.8.2 for inspection. Results logged to C:/Users/User/.vagrant.d/gems/gems/json-1.8.2/ext/json/ext/generator/gem_make.out $

---

The gem_make.out file contains the same output as the text above, so I won't paste/upload it.

[7heo]

Additionally, gem install json -v '1.8.2' fails, since /bin/env obviously doesn't exist:

$ /c/Program\ Files\ \(x86\)/HashiCorp/Vagrant/embedded/bin/gem install json -v '1.8.2'
/bin/env: ruby: No such file or directory