[Rpm-maint] [rpm-software-management/rpm] RFE OptionalBuildRequires (#577)

[Tom de Vries]

Say I have a package A build with optional feature B, which depends on package B:
`BuildRequires:  B-devel
`

Now I find out that A doesn't work with B version >= x.

The simplest way to express this is to use:
`BuildRequires:  B-devel < x
`
but that makes the build fail for distros that have B >= x.

What I want is to enable B for distros where it works, and to disable it for distros where it doesn't work.

I have the option of mapping B version x to distro version y, and use:
```
%if 0%{distro_version} < y
BuildRequires:  B-devel
%endif
```
but I'd like to have an option to make this work without distro mapping.

So something along the lines of:
`OptionalBuildRequires:  B-devel < x
`
which works as BuildRequires but doesn't make the build fail if the package is not present.

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