--- /usr/portage/media-libs/mesa/mesa-20.3.2.ebuild     2020-12-31 06:09:22.000000000 +0100
+++ mesa-20.3.2.ebuild  2021-01-05 12:12:13.218227564 +0100
@@ -370,7 +370,7 @@
        local platforms
        use X && platforms+="x11"
        use wayland && platforms+=",wayland"
-       [[ -n $platforms ]] && emesonargs+=(-Dplatforms=${platforms#,})
+       emesonargs+=(-Dplatforms=${platforms#,})
 
        if use X || use egl; then
                emesonargs+=(-Dglvnd=true)