Install marble

options.conf.d/desktop.conf

@@ -31,6 +31,7 @@ media-sound/audacious gtk
 
 # kde
 x11-libs/qtbase sql sqlite
+media-libs/phonon qt4
 
 # xfce
 xfce-base/libxfce4ui gtk3
@@ -56,9 +57,8 @@ net-misc/youtube-viewer gtk
 
 # marble
 kde/marble qt-only -python
-media-libs/phonon-gstreamer qt4
-media-libs/phonon qt4
-x11-libs/qt:4 phonon
+media-libs/phonon-gstreamer qt5
+media-libs/phonon qt5
 
 # dianara
 app-crypt/qca qt4

package_mask.conf

@@ -1,4 +1,4 @@
->kde/marble-15
+#>kde/marble-15
 
 # for kernel 3.18 compatibility
 >=sys-kernel/linux-headers-3.19

sets/desktop.conf

@@ -6,7 +6,7 @@
 * app-text/texmaker
 * gnome-desktop/GPaste
 * gnome-desktop/evince
-#* kde/marble
+* kde/marble
 * kde/okular
 * mail-client/thunderbird
 * media-gfx/gthumb