It would be helpful to know what you were trying to do when you got this error message. Please provide some context.
The QT Installer Framework is not usually in most distros repositories.
It does not appear to be on Gentoo:
https://packages.gentoo.org/categories/dev-qt
There was a bug posted requesting an ebuild for it at one time:
https://bugs.gentoo.org/545840
I don't think it was ever added as interest appears minimal.
If you are trying to create and package QT software for distribution, you will need to download the latest QT Installer Framework yourself, (it is provided as source and as pre-built binaries):
https://download.qt.io/official_release ... -framework
This is the program that contains binarycreator.
If you are not trying to create and package QT software for distribution, but still got this error message, then more context is needed to understand why.