wrong dependence of lightning-extension

[高珺]

Hi, I'm a user of Xubuntu 9.04.
Today, I installed lightning-extension on my computer and find some 
problems (no import menu item, etc.)
After searching useful information on the Internet, I found it was 
caused by the wrong dependence.

According to the System Requirement of Lightning.
http://www.mozilla.org/projects/calendar/lightning/system-requirements.html#linux
It is said that:
libstdc++5
(Many modern Linux distributions only package libstdc++6, which is 
incompatible with Lightning. Therefore please install the package 
"libstdc++5" or "compat-libstdc++" on your system *before* installing 
Lightning)

I installed libstdc++5 and then reinstall lightning-extension, the 
problem described before was gone.

And I found that the dependence of lightning-extension was
libstdc++6 (>=4.1.1)
So, could you change the dependence to libstdc++5)

With Best Regards.
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