bson_ext在ubuntu上失败

Question

我已经为pophealth安装了所有依赖项：

“https://github.com/pophealth/popHealth/wiki/Installation”

但是当我运行Bundle Install时，我收到以下错误：

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

/usr/bin/ruby1.8 extconf.rb
extconf.rb:1:in 'require': no such file to load -- mkmf (LoadError)
from extconf.rb:1



Gem Files will remain installed in /home/pophealth/.bundler/tmp/3335/gems/bson_ext-1.5.1 for inspection
results logged to /home/pophealth/.bundler/tmp/3335/gems/bson_ext-1.5.1/ext/cbson/gem_make.out

An error occurred while installing bson_ext (1.5.1), and bundler cannot continue.

Make sure that 'gem install bson_ext -v '1.5.1'' succeeds before bundling.

当我运行gem install bson_ext -v '1.5.1'时，我收到以下错误