Do not build with qt4 on RHEL8. qt4 isn't currently available for RHEL8.

plasma-breeze.spec

@@ -3,8 +3,11 @@
 
 %global         base_name   breeze
 
-# disable kde4 build on < f30, temp workaround for FTBFS
+# disable kde4 build on RHEL8+
 %global         build_kde4  1
+%if 0%{?rhel} && 0%{?rhel} > 7
+%global         build_kde4  0
+%endif
 
 Name:    plasma-breeze
 Version: 5.18.90
@@ -84,7 +87,7 @@ Provides:       breeze-cursor-themes = %{version}-%{release}
 %description -n breeze-cursor-theme
 %{summary}.
 
-%if 0%{?build_kde4:1}
+%if 0%{?build_kde4}
 %package -n     kde-style-breeze
 Summary:        KDE 4 version of Plasma 5 artwork, style and assets
 BuildRequires:  kdelibs4-devel
@@ -113,7 +116,7 @@ popd
 %make_build -C %{_target_platform}
 
 
-%if 0%{?build_kde4:1}
+%if 0%{?build_kde4}
 mkdir %{_target_platform}_kde4
 pushd %{_target_platform}_kde4
 %{cmake_kde4} -DUSE_KDE4=TRUE ..
@@ -128,7 +131,7 @@ make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
 
 %find_lang breeze --all-name
 
-%if 0%{?build_kde4:1}
+%if 0%{?build_kde4}
 make install/fast DESTDIR=%{buildroot} -C %{_target_platform}_kde4
 %endif
 
@@ -169,7 +172,7 @@ mv %{buildroot}%{_kf5_datadir}/kconf_update/kde4breeze.upd \
 %{_datadir}/QtCurve/Breeze.qtcurve
 %{_datadir}/wallpapers/Next/
 
-%if 0%{?build_kde4:1}
+%if 0%{?build_kde4}
 %ldconfig_scriptlets -n kde-style-breeze
 
 %files -n kde-style-breeze