Ehmm I thought the backward compatibility is 72,2% from 0.9.8 to 1.0.x, for qt4-x11 it shouldn't be a problem but I thought for other packages it could be a problem if they use removed Symbols. For qt4-x11 you will only need a patch when you want to use openssl 1.1.x.

Hmm but maybe I am wrong I found something similar to your package:

https://github.com/agamez/maemo-openssl-1.0.2

I will try both.

But another thing, for qt4-x11 there is only a build dependencie with libssl-dev but no dependencie to libssl for installing. So I could rebuild qt4-x11 with other openssl and don't need to replace the maemo one?