Add environment variables to root user

How do I add environment variables, so they are available to the sudo command?
I need it to correct the known ruby/rails flaw, that you loose some setup, when updating rubygems.
I know I need to set:
+export GEM_HOME="/Library/Ruby/Gems/1.8"+
+export GEM_PATH="/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/g ems/1.8"+
but adding those variables to .bashrc, or .bash_profile doesn't make them available for sudo, and so the command
+sudo gem update+
actually fails. (only 'gem update' works though)
Practically I don't need the sudo anyway, since the Ruby directories are not only root writeable, but I want to repair the state of my rubygems installation to the way it was befor doing the rubygems system update.
Can someone tell me, where I could add environment variables to the sudo environment?

Which shell are you using?
If you're using /bin/sh you have to do:
cdate=$(date +%m/%d)
export cdate
You cannot set and export variable in the same command.
-R

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