Comment # 1 on bug 1142348 from Tom de Vries

(In reply to Tom de Vries from comment #0)
> +Requires:       liblzma5
> +BuildRequires:  xz-devel

Hmm, apparently the Requires is not necessary:
...
[ 4646s] RPMLINT report:
[ 4646s] ===============
[ 4658s] gdb.x86_64: W: explicit-lib-dependency liblzma5
[ 4658s] You must let rpm find the library dependencies by itself. Do not put
unneeded
[ 4658s] explicit Requires: tags.
...