Update baloo-widgets.spec

baloo-widgets/baloo-widgets.spec

@@ -17,6 +17,8 @@ VCS:            git:https://invent.kde.org/libraries/baloo-widgets.git
 #!RemoteAsset:  sha256:0b03fc0adfeda46deeb53fb5e22bb9108715ebc1d8f5b19ca4e5c2216332c711
 Source0:        https://download.kde.org/stable/release-service/%{version}/src/%{name}-%{version}.tar.xz
 
+BuildSystem: cmake
+
 BuildRequires:  kf6-extra-cmake-modules >= %{kf6_version}
 BuildRequires:  cmake(KF6Baloo) >= %{kf6_version}
 BuildRequires:  cmake(KF6Config) >= %{kf6_version}
@@ -40,16 +42,7 @@ Requires:       cmake(Qt6Widgets) >= %{qt6_version}
 %description    devel
 Development package for baloo-widgets
 
-%prep
-%autosetup -p1 -n %{name}-%{version}
-
-%build
-%cmake_kf6
-
-%kf6_build
-
-%install
-%kf6_install
+%install -a
 
 # todo: fix the name error.
 # Avoid illegal package names