[darkr]

RPM 4.12.0 brought in support for weak dependencies, which implements the tags Recommends, Suggests, Supplements and Enhances, which provides analog functionality from apt > http://rpm.org/wiki/Releases/4.12.0

This is in Fedora 21, so should be in RHEL 8.

[lisivka]

Newest version of RPM 4.13 will implemented logical dependencies, e.g. Require: foo IF bar , Require: foo OR bar OR baz, which are far more usable than soft dependencies.