[Rubygems-developers] Binary gems or extension source - which and how?

Luis Lavena luislavena at gmail.com
Thu May 22 01:02:45 EDT 2008

On Thu, May 22, 2008 at 12:25 AM, Clifford Heath
<clifford.heath at gmail.com> wrote:
> Thanks Luis. I got the gem to build automatically, but the
> shared library load path doesn't seem to be set correctly.
> The require_paths in the gemspec is ["lib", "ext/wbxml"],
> but the .bundle built on MacOSX doesn't load when the
> .rb in the lib directory says "require 'wbxml.so'".
> Any idea what the story is here?

What are you trying to do?

you mention a bundle file, but then a require 'wbxml.so'?

first of you need to remove extensions from your requires, that breaks
compatibility since OSX uses 'bundle' and Linux/Windows uses 'so' as
extensions for the shared objects.

> If anyone wants to check it out, it's the wbxml project on
> RubyForge. You'll need libwbxml-dev (or port install wbxml2)
> to build it.

I've checked your Rakefile:


And you're assuming a lot about the extension (and the extension of it too).

I suggest you take a look at DrNic post about newgem generators
related to building C extensions:


> The answer to getting the gem to build extensions on install
> was to modify the config/hoe.rb generated by "newgem", adding
> # Arrange to build the extension on install:
> $hoe.spec.extensions = ['ext/wbxml/extconf.rb']

As I commented before, Hoe was not aimed to create gems that bundles
extensions out of the box.

Are you trying to build a native (pre-build) platform specific gem? or
are you trying to include in your gem the C extension?

Luis Lavena
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the experience of others, are also remarkable for their apparent
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