Comment # 4 on bug 933043 from Dr. Werner Fink

(In reply to Jim Fehlig from comment #3)

you may use in the spec file

  %if 0%{suse_version} <= 1320
  %patch .....
  %endif

as there will be no backport of this feature for 13.2 ... for SLES12 this my
become a feature for SP2.

Or you are using an autodetection of the systemd version

  BuildRequire:  pkgconfig(systemd)

  [...]

  %global systemd_version %(pkg-config --modversion systemd)

  [...]

  %if 0%{systemd_version} >= 219
  %patch .....
  %endif