Comment # 7 on bug 962599 from Matwey Kornilov

There IS build difference. 

%prep
%setup -q -n rebar-%{version}
%patch1 -p1
%patch2 -p1
%if 0%{?obs}
%patch3 -p1
%patch4 -p1
%endif
%patch5 -p1

Patches 3 and 4 are applied only for -obs.