rpm-macros: Requires: epel-rpm-macros on rhel8

At least until cmake macros are updated  in rhel8's cmake, see also
https://bugzilla.redhat.com/show_bug.cgi?id=1858941

kf5.spec

@@ -1,6 +1,6 @@
 Name:    kf5
 Version: 5.73.0
-Release: 1%{?dist}
+Release: 2%{?dist}
 Summary: Filesystem and RPM macros for KDE Frameworks 5
 License: BSD
 URL:     http://www.kde.org
@@ -27,6 +27,11 @@ Requires: qt5-rpm-macros >= 5.11
 Requires: cmake3
 Requires: qt5-qtbase-devel >= 5.11
 %endif
+%if 0%{?rhel} == 8
+# This is where cmake-related macros live, e.g. %%cmake_build, %%cmake_install
+# at least until fixed upstream, https://bugzilla.redhat.com/show_bug.cgi?id=1858941
+Requires: epel-rpm-macros
+%endif
 # misc build environment dependencies
 Requires: gcc-c++
 BuildArch: noarch
@@ -82,6 +87,9 @@ sed -i \
 
 
 %changelog
+* Sat Aug 22 2020 Rex Dieter <rdieter@fedoraproject.org> - 5.73.0-2
+- rpm-macros: Requires: epel-rpm-macros on rhel8
+
 * Mon Aug 03 2020 Rex Dieter <rdieter@fedoraproject.org> - 5.73.0-1
 - 5.73.0