>Hi,
>
>In this list there were a couple of times when the following constant
>has been mentioned:
>FFI::Library::LIBC
>
>Which is a pretty handy thing, since it guarantees to proper value for
>C lib on every platform.
>
>*BUT*, it is not available on the latest ruby-ffi 0.5.4 (on Windows, at least).
>
>Furthermore, the constants in FFI::Library are just different:
>
>1. JRuby-dev: FFI::Library.constants
>=> ["LIBC", "CURRENT_PROCESS"]
>
>2. ruby-ffi with MRI 1.8.7: FFI::Library.constants
>=> ["DEFAULT"]
>
>It would be great to have the constants aligned. At the minimum, it
>would be really nice to have FFI::Library::LIBC present.
>

I get the same results on a Mac using v0.5.4

After installing v 0.6.0 from source I get:

>> FFI::Library.constants

=> ["CURRENT_PROCESS", "LIBC"]

Needed to update RakeFile to specify dependency on bones < 3.0.0

The setup method has been removed from Bones 3.x and
at least the documentation has stopped mentioning the use
of PROC.<method> in the RakeFile.

see:
http://github.com/stepheneb/ffi/commit/b4c6e89f6a60bcd150077d59c93397d9cf77a1e5