While executing gem ... ["extconf.rb", ...] are not files

I'm trying to build a ruby gem around a C extension. The C extension compiles fine using the `ruby extconf.rb; make; sudo make install` routine, but when I try to build a gem using rake, the process terminates with the error at the bottom of this trace.

I'm using the post [here][1], with the same directory structure, to create the gem.

What's wrong with my configuration? My gemspec and Rakefile are below the trace (the gem is called netconf).

// Trace

** Execute copy:netconf:i686-linux:1.9.2
install -c tmp/i686-linux/netconf/1.9.2/netconf.so lib/netconf/netconf.so
** Execute compile:netconf:i686-linux
** Execute compile:i686-linux
** Execute compile
** Invoke chmod (first_time)
** Execute chmod
** Execute build
rake aborted!
ERROR: While executing gem ... (Gem::InvalidSpecificationException)
["extconf.rb", "netconf.o", "netconf.so"] are not files

// netconf.gemspec

# -*- encoding: utf-8 -*-
$:.push File.expand_path("../lib", __FILE__)
require "netconf/version"

Gem::Specification.new do |s|
s.name = "netconf"
s.version = Netconf::VERSION
s.authors = ["..."]
s.email = ["..."]
s.homepage = "..."
s.summary = %q{A tool to access and write Ubuntu network configuration}
s.description = %q{Uses ifconfig and other C system calls to access network configurations on a Ubuntu install.}

s.rubyforge_project = "netconf"

s.files = `git ls-files`.split("\n")
s.executables = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
s.require_paths = ["lib"]
s.extensions = ["ext/netconf/extconf.rb"]
end

// Rakefile

require 'rake'
require 'rake/extensiontask'
require 'bundler'

Rake::ExtensionTask.new("netconf") do |extension|
extension.lib_dir = "lib/netconf"
end

task :chmod do
File.chmod(0775, 'lib/netconf/netconf.so')
end

task :build => [:clean, :compile, :chmod]

Bundler::GemHelper.install_tasks

[1]:

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FWIW, I had a similar issue where

s.files = `git ls-files`.split("\n")

was

s.files = `git ls-files`.split('\n')

, where the single quotes were preventing the file list from splitting properly. Changing to double quotes fixed the issue for me.

I got this error because I hadn't commited my updates with git yet.

s.files = `git ls-files`.split("\n")

That line is directly using git, and probably causing this error. Just do

git add .
git commit -a -m "init"