NOTE: Gem::Specification#default_executable= is deprecated with no replacement. It will be removed on or after 2011-10-01.

How to get rid of the error message:


NOTE: Gem::Specification#default_executable= is deprecated with no replacement. It will be removed on or after 2011-10-01.


after doing a:

sudo gem update --system


I just ran the following manually,

gem -v 2>&1 |grep called


and then for each gem returned ran the command,


$ sudo gem pristine rcov -- -build-arg


The sudo part may not be required, I was using an upgraded basic install from Apple.

Example:

~ $ gem -v 2>&1 |grep called
Gem::Specification#has_rdoc= called from /Library/Ruby/Gems/1.8/specifications/actionmailer-2.3.5.gemspec:14.

$ sudo gem pristine actionmailer -- -build-arg
...
Restored actionmailer-3.0.7



#!/usr/bin/env bash
#

brew install gnu-sed
sudo gem pristine --all --no-extensions
gems=$(gem -v 2>&1 | grep called | gsed -r -e 's#^.*specifications/##' -e 's/-[0-9].*$//')

for gem in $gems
do
echo Fixing $gem...
sudo gem pristine $gem -- -build-arg
done


install a specific version of a gem

gem install rake --version=0.8.7


Thanks to the postings at:
http://stackoverflow.com/questions/5949521/how-do-i-fix-rubygems-recent-deprecation-warning