It turns out that #5 requires git 2.18 or newer

Author: RKrahl

CHANGES.rst

@@ -8,11 +8,16 @@ Changelog
 New features
 ------------
 
-+ `#2`_, `#5`_: get the default prefix from git configuration
++ `#2`_, `#5`_: get the default prefix from git configuration.
 
 .. _#2: https://github.com/RKrahl/git-attic/issues/2
 .. _#5: https://github.com/RKrahl/git-attic/pull/5
 
+Incompatible changes
+--------------------
+
++ Require git version 2.18 or newer.
+
 Minor changes
 -------------
 

README.rst

@@ -30,7 +30,7 @@ Python:
 
 External Programs:
 
-+ `git`_
++ `git`_ >= 2.18
 
 Required library packages:
 

git-attic.spec

@@ -11,12 +11,12 @@ License:	Apache-2.0
 Group:		Development/Tools/Version Control
 Source:		%{name}-%{version}.tar.gz
 BuildRequires:	python3-base >= 3.5
-BuildRequires:	git-core
+BuildRequires:	git-core >= 2.18.0
 %if %{with tests}
 BuildRequires:	python3-distutils-pytest
 BuildRequires:	python3-pytest >= 3.9
 %endif
-Requires:	git
+Requires:	git >= 2.18.0
 Recommends:	man
 BuildArch:	noarch
 BuildRoot:	%{_tmppath}/%{name}-%{version}-build