UPDATE: Mozilla provides now also an amd64 build.
I am using gentoo linux on an amd64 machine and I upgraded to Thunderbird 3. The official Lightning Release 0.9 is only running on Thunderbird 2.*
Thunderbird 3 needs Lightning 1.0b1, on official Mozilla Sites I couldn't find any build of lightning 1.0b1 for Linux on amd64.
I build Lightning on my own, guided by the instructions on the Mozilla Dev Site.
You can download my lightning.xpi here.
calendar-timezones.xpi and gdata-provider.xpi were also created.
No warranty on using this unofficial XPI Files!
Lightning is running fine on my Machine. No warranty on using this Lighting Build!
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If you want build your own Lightning:
In Addition to the Instructions on the Mozilla Dev Site I had to apply a patch from bugzilla.mozilla.com:
wget https://bugzilla.mozilla.org/attachment.cgi?id=416546 -O patchBug533070
hg patch patchBug533070
# all in the comm-1.9.1 directory
and I used the following .mozconfig:
ac_add_options --enable-application=calendar
mk_add_options MOZ_OBJDIR=TOPSRCDIR/objdir-sb-release
mk_add_options MOZ_MAKE_FLAGS="-j4"
ac_add_options --enable-calendar --disable-official-branding