blocks many applications, especially a vital one for me, evolution

 * These packages depend on net-libs/webkit-gtk:
mail-client/evolution-3.36.5 (>=net-libs/webkit-gtk-2.13.90:4)
media-gfx/shotwell-0.31.0 (>=net-libs/webkit-gtk-2.4:4)
net-libs/libproxy-0.4.18 (webkit ? net-libs/webkit-gtk:4)
x11-libs/wxGTK-3.0.4-r301 (webkit ? net-libs/webkit-gtk:4)

 * Messages for package net-libs/webkit-gtk-2.34.1:

 * ERROR: net-libs/webkit-gtk-2.34.1::gnome-kit failed (compile phase):
 *   ninja -v -j9 -l0 failed
 *
 * Call stack:
 *     ebuild.sh, line   93:  Called src_compile
 *   environment, line 4294:  Called cmake_src_compile
 *   environment, line 1703:  Called cmake_build
 *   environment, line 1672:  Called eninja
 *   environment, line 2170:  Called die
 * The specific snippet of code:
 *       "$@" || die "${nonfatal_args[@]}" "${*} failed"