I see that the non-x86_64 packages are failing. Haven't had time to dig in to why.

One thing I did differently on all the packages I ported over was to reverse the logic in the spec file:

%if 0%{?fedora} > 34

BuildRequires: <openexr and/or imath>

%else

BuildRequiers: <however the package did it before>

%endif

If the package was CMake based I would use the "cmake(OpenEXR)" method or for autotools "pkgconfig(OpenEXR)". 

I'm not sure if it makes a difference.

Thanks,

Richard