我正在使用 Archlinux,ruby 位置在 /usr/bin/ruby
$ ruby --version
ruby 2.0.0p247 (2013-06-27 revision 41674) [i686-linux]
$ gem install ffi
Building native extensions. This could take a while...
Successfully installed ffi-1.9.0
Parsing documentation for ffi-1.9.0
Done installing documentation for ffi after 41 seconds
1 gem installed
我正在使用 G-WAN 执行 ruby 脚本,但是当我使用require 'ffi'
此输出时:
/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- ffi (LoadError)
from /usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/asd/bin/gwan_linux32-bit/127.0.0.1_8081/#127.0.0.1/csp/test.rb:1:in `<main>'
并require '/home/asd/.gem/ruby/2.0.0/gems/ffi-1.9.0/lib/ffi.rb'
显示:
/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- ffi_c (LoadError)
from /usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/asd/.gem/ruby/2.0.0/gems/ffi-1.9.0/lib/ffi.rb:14:in `rescue in <top (required)>'
from /home/asd/.gem/ruby/2.0.0/gems/ffi-1.9.0/lib/ffi.rb:3:in `<top (required)>'
from /usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/asd/bin/gwan_linux32-bit/127.0.0.1_8081/#127.0.0.1/csp/test.rb:21:in `<main>'
的输出p $LOAD_PATH
是:
["/usr/lib/ruby/site_ruby/2.0.0" # doesn't exists
, "/usr/lib/ruby/site_ruby/2.0.0/i686-linux" # doesn't exists
, "/usr/lib/ruby/site_ruby" # doesn't exists
, "/usr/lib/ruby/vendor_ruby/2.0.0" # doesn't exists
, "/usr/lib/ruby/vendor_ruby/2.0.0/i686-linux" # doesn't exists
, "/usr/lib/ruby/vendor_ruby" # doesn't exists
, "/usr/lib/ruby/2.0.0"
, "/usr/lib/ruby/2.0.0/i686-linux"
]
FFI 的位置是:
$ locate ffi.rb
/home/asd/.gem/ruby/2.0.0/gems/ffi-1.9.0/lib/ffi.rb
/home/asd/.gem/ruby/2.0.0/gems/ffi-1.9.0/lib/ffi/ffi.rb
/opt/jruby/lib/ruby/shared/ffi.rb
/opt/jruby/lib/ruby/shared/ffi/ffi.rb
/opt/jruby/samples/ffi/ffi.rb
所以我尝试将目录添加到 $LOAD_PATH
$LOAD_PATH.unshift '/home/asd/.gem/ruby/2.0.0/gems/ffi-1.9.0/lib'
现在require 'ffi'
显示没有错误..
如果我已经在 ~/.gem/ruby/2.0.0/gems 上安装了许多 gem
$ ll ~/.gem/ruby/2.0.0/gems/ | wc
285 2558 17502
使用宝石的正确方法是什么?是通过将每个路径添加到 $LOAD_PATH