Essential packages should not be in (Build)Requires

packaging/template.spec

 
 Source0:        %{name}-%{version}.tar.gz
 BuildArch:      noarch
-BuildRequires:  coreutils
 BuildRequires:  shellfu => 0.10
 BuildRequires:  shellfu < 0.11
 BuildRequires:  shellfu-bash-inigrep