#!/bin/sh -efu
log=$1
removed=$(gzip -cdfq "$log" |sed -n 's/^-Requires: \(lib.*\.so[^(]*\)(.*/\1/p' |sort -u)
[ -n "$removed" ] || exit 0
requires=$(gzip -cdfq "$log" |egrep '^([ +]Requires:|Requires[(:]|PreReq:)' |cut -d: -f2-)
for soname in $removed; do
	if printf '%s\n' "$requires" |fgrep -qs " $soname("; then
		continue
	fi
	printf '%s\t%s\n' "${log%.gz}" "$soname"
done