Sabayon 5.5 amd64
equo libtest
>> @@ discarding directory: /usr/lib64, because it's symlinked on: /usr/lib
>> @@ discarding directory: /lib64, because it's symlinked on: /lib
>> @@ Matching broken libraries/executables
>> @@ Libraries/Executables statistics:
>> ## Matched:
>> /usr/lib/thunderbird/components/libimglib2.so => mail-client/thunderbird-3.1.7-r2 [sabayonlinux.org]
>> /usr/lib/thunderbird/components/libgklayout.so => mail-client/thunderbird-3.1.7-r2 [sabayonlinux.org]
>> /usr/lib/thunderbird/components/libaccessibility.so => mail-client/thunderbird-3.1.7-r2 [sabayonlinux.org]
>> /usr/lib/thunderbird/components/libmozldap.so => mail-client/thunderbird-3.1.7-r2 [sabayonlinux.org]
>> /usr/lib/thunderbird/components/libwidget_gtk2.so => mail-client/thunderbird-3.1.7-r2 [sabayonlinux.org]
>> /usr/lib/thunderbird/components/libgkgfxthebes.so => mail-client/thunderbird-3.1.7-r2 [sabayonlinux.org]
>> /usr/lib/thunderbird/components/libgkplugin.so => mail-client/thunderbird-3.1.7-r2 [sabayonlinux.org]
Thunderbird reinstalled.
Run libtest again, same errors and it reinstalled Thunderbird again, there is a bug here.

