Bin To Pkg Better ((better)) -

fpm -s dir -t osxpkg -n myapp -v 1.0 \ --prefix /usr/local/bin \ --after-install ./postinstall.sh \ ./mybinary.bin

Do not use generic tools like tar + xar . Use professional-grade packagers: bin to pkg better

Converting files (often associated with disc images or payloads) into fpm -s dir -t osxpkg -n myapp -v 1