A CTF host’s worst nightmare is unintentionally not including all the files needed for competitors to actually solve a challenge. It’s annoying for hosts, annoying for competitors, and worst of all is super easy to avoid.
Anyway, just run this!
bash -c "ldd $BINARY | grep '=>' | cut -d' ' -f3 | xargs -I '{}' cp -L -v '{}' /build/"