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post_install() { mv /usr/lib/thunderbird/{librnp.so,librnp.so.orig} ln -s /usr/lib/libsequoia_octopus_librnp.so /usr/lib/thunderbird/librnp.so } pre_remove() { rm /usr/lib/thunderbird/librnp.so mv /usr/lib/thunderbird/{librnp.so.orig,librnp.so} }