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I'm using SlackWare current (>12.2) which is working real good, XFCE4.6 and Thunderbird 2.0.0.21.
After installing the Add-On, it was not working (I was unable to create new events or new tasks, these menu points are greyed out). After reading the system requirements, I found out that libstdc++5 is needed, which I installed under /usr/lib.
I uninstalled lightning, made a reboot and a new install of lightning, but it is still not working.
I searched around for some hints, but couldn't find any usefull.
Please note that Linux distributors may provide packages for your distribution which have different requirements.
* Linux kernel - 2.2.14 or higher with the following libraries or packages:
o glibc 2.3.2 or higher
o XFree86-3.3.6 or higher
o gtk+2.0 or higher
o fontconfig (also known as xft)
o 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)
At home I'm using SlackWare Current also, installed Lightning, and it works out of the box ! At that time I can't figure out the difference between the two software installations (the hardware is different, in the office it's an Intel Dual Core, at home an AMD 6000+ Dual Core, but that should'n do anything).
With lsof | grep libstdc++ I saw that thunderbird uses libstdc++.so.5.0.7, which is part of the distribution in /usr/i486-slackware-linux/lib (and also configured in /etc/ld.so.conf). So the installation of libstdc++ in /usr/lib was unnessacarry ...
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