Installing bcrypt-ruby (3.1.2) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/opt/metasploit/ruby/bin/ruby extconf.rb
checking for ruby/util.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
--without-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/metasploit/ruby/bin/ruby
/opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:506:in `try_cpp'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:931:in `block in have_header'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
from /opt/metasploit/ruby/lib/ruby/1.9.1/mkmf.rb:930:in `have_header'
from extconf.rb:14:in `<main>'
Gem files will remain installed in /opt/metasploit/ruby/lib/ruby/gems/1.9.1/gems/bcrypt-ruby-3.1.2 for inspection.
Results logged to /opt/metasploit/ruby/lib/ruby/gems/1.9.1/gems/bcrypt-ruby-3.1.2/ext/mri/gem_make.out
An error occured while installing bcrypt-ruby (3.1.2), and Bundler cannot continue.
Make sure that `gem install bcrypt-ruby -v '3.1.2'` succeeds before bundling.
然后谁可以告诉我接下来怎么办啊？

尝试一下
root@bt:~# gem install bcrypt- ruby -v '3.1.2'
ERROR: Could not find a valid gem 'bcrypt-' (= 3.1.2) in any repository
ERROR: Could not find a valid gem 'ruby' (= 3.1.2) in any repository
又尝试一下：
root@bt:~# gem install bcrypt-ruby
#######################################################
The bcrypt-ruby gem has changed its name to just bcrypt. Instead of
installing `bcrypt-ruby`, you should install `bcrypt`. Please update your
dependencies accordingly.
#######################################################
Successfully installed bcrypt-ruby-3.1.5
1 gem installed
Installing ri documentation for bcrypt-ruby-3.1.5...
Installing RDoc documentation for bcrypt-ruby-3.1.5...
root@bt:~# bundle install
Bundler::GemfileNotFound

哎 ，捉急了一天。吃泡面去了。

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