Find all lib dependencies of a sub-dir that are not contained in that dir

list-libs.sh

#!/bin/bash
dir=$1

for file in $(find "$dir" -name "lib*.so" -or -wholename "*/bin/*"); do
    objdump -x $file 2>/dev/null | grep NEEDED
done | sort -u | awk '{print $2}' > /tmp/all-libs

while read -r -u 10 lib; do
    ( find "$dir" -name "$lib" -print0 | grep -qz . ) || echo "$lib"
done 10</tmp/all-libs