current failure on my nix on rebuild

rebuild.log

$ nixos-rebuild build
building Nix...
building the system configuration...
these derivations will be built:
  /nix/store/3xl8l4vddvfqx0gyd9z3fgm0jr2by04a-system-path.drv
  /nix/store/mpqrssb0kp9w7gw7ba9sp5w4a4ghbdx5-dbus-conf.drv
  /nix/store/6ksh6khm1zhbaaajrnz19xn0r7vkf8yr-unit-dbus.service.drv
  /nix/store/ik8s9nl1yp0kqmjyq7ln2sn0886wpqk0-xsession.drv
  /nix/store/6nq41xm72h8vyyh1a9f4hmqcya54zifz-desktops.drv
  /nix/store/mrq5406caknwwkdd6cvhlm7wg6g9dsbh-hwdb.bin.drv
  /nix/store/k9y41dpjgfrq5vs7z1i1dnczmg64bqia-unit-dbus.service.drv
  /nix/store/v86n65r1jwiwcmi2h1lsbnqmnbl9ac1a-user-units.drv
  /nix/store/bj59sz9q8prb8k9d60686grh80n0iqmv-unit-polkit.service.drv
  /nix/store/d0krvmfhy2h73zqflhj44bl06y0lf269-unit-display-manager.service.drv
  /nix/store/vj3bk6bm300585n1ywbncryl5r6p9swc-system-units.drv
  /nix/store/9k4jxcmdab8mf3g4dc20wdhphj7pli44-etc.drv
  /nix/store/i9cy13a70fqq9h43kczvgvxq6rr3g1dc-nixos-system-ronny-ownpc-16.09.1098.6fe0069.drv
building path(s) ‘/nix/store/nqpb3kbv8iy8cgsqm01pmczfan41dmvp-hwdb.bin’
building path(s) ‘/nix/store/71wc6j2h3918plw3k5drpjpcdn4phsm8-system-path’
Adding hwdb files for package /nix/store/inbr0qixfmq0js9pwm8n0bhqad865mab-systemd-231
Adding hwdb files for package /nix/store/lbfi3gw82y0l3la3xdb7bxwkhy798hiy-libmtp-1.1.11-bin
Adding hwdb files for package /nix/store/zv82ry4lqcrp945z66hxbqvja9pb1rvi-media-player-info-22
Adding hwdb files for package /nix/store/2p7ijdgv7wz30i3k5gdml6xg9pn9xzpk-mdadm-3.3.4
Adding hwdb files for package /nix/store/6crz7lrakdn4f5lgwjpahysa9rh1y44m-lvm2-2.02.140
Adding hwdb files for package /nix/store/m0hwx4j24vagbyrk0ni32ak0gp1y1m93-libinput-1.3.3
Adding hwdb files for package /nix/store/dq299cb5b7m90i2j03xhrps26925f84g-colord-1.2.12
Adding hwdb files for package /nix/store/dgzld27xij01xh7qc2yp3fs8nbd67fpc-ModemManager-1.4.16
Adding hwdb files for package /nix/store/68fml7yqvcvd47wyn0mz1y2kjc5l7yzl-network-manager-1.2.4
Adding hwdb files for package /nix/store/r4qdqmziay122yh0049vrh4gc7c6s61c-NetworkManager-l2tp-gnome-1.2.4
Adding hwdb files for package /nix/store/1xffw3mz8wlkscfqqaj6yxzmgpwax7pd-NetworkManager-openconnect-gnome-1.2.2
Adding hwdb files for package /nix/store/zmawv9skm7alysick86k9f3c9zmapmcg-NetworkManager-openvpn-gnome-1.2.6
Adding hwdb files for package /nix/store/kzq42inqk417pa5cx8vyg9n0br96z6b4-NetworkManager-pptp-gnome-1.2.4
Adding hwdb files for package /nix/store/0c6bh3idyh3lmarl05pq16f7wdf2dnyd-NetworkManager-vpnc-gnome-1.2.4
Adding hwdb files for package /nix/store/60jgmh6gh9vfjl3sv505l3vpbf2mdrv3-wpa_supplicant-2.5
Adding hwdb files for package /nix/store/1dy0aiwz3ymrqxcq8avfrpckwpnxkf8c-upower-0.99.4
Adding hwdb files for package /nix/store/9hh3wnh7y1j5w659032s99fplwsh0ymv-udisks-2.1.6
Adding hwdb files for package /nix/store/dr90gvhg0pnr3kzgijfx2649kshm4ci7-extra-udev-rules
Adding hwdb files for package /nix/store/x9hp2yz7ylby766nah7b6ls31a8b3vnp-extra-hwdb-file
Adding hwdb files for package /nix/store/65pzq1j3qpcriicxmdyhkirq43mc010x-bluez-5.40
Adding hwdb files for package /nix/store/lbfi3gw82y0l3la3xdb7bxwkhy798hiy-libmtp-1.1.11-bin
ln: failed to create symbolic link 'etc/udev/hwdb.d/69-libmtp.hwdb': File exists
builder for ‘/nix/store/mrq5406caknwwkdd6cvhlm7wg6g9dsbh-hwdb.bin.drv’ failed with exit code 1
collision between `/nix/store/504y6qxf5w2dinnmnhk6zq03xl8axj50-gvfs-1.22.4/lib/gio/modules/giomodule.cache' and `/nix/store/hhqc2n3dasyf7hsf1ix2hz6yjxklybb7-glib-networking-2.46.1/lib/gio/modules/giomodule.cache'
collision between `/nix/store/lsh5r1l7mkgigw3qylazm65fjrbi0da8-dconf-0.24.0/lib/gio/modules/giomodule.cache' and `/nix/store/hhqc2n3dasyf7hsf1ix2hz6yjxklybb7-glib-networking-2.46.1/lib/gio/modules/giomodule.cache'
collision between `/nix/store/l4ljd06l50x2j3jb0ps5qr8zmwyk3l3v-gnome-terminal-3.20.2/share/dbus-1/interfaces/org.gnome.ShellSearchProvider2.xml' and `/nix/store/s7q8nazcwvwmnck3h128rjyb9pdp087i-gnome-shell-3.20.3/share/dbus-1/interfaces/org.gnome.ShellSearchProvider2.xml'
collision between `/nix/store/zjrrnah6sbfn6wd2qdbs24yxnxk783bc-phonon-backend-gstreamer-qt5-4.9.0/share/icons/hicolor/128x128/apps/phonon-gstreamer.png' and `/nix/store/a8qrlxjvrb7lgykn1xivn1r5sm5cjzv8-phonon-backend-gstreamer-qt4-4.9.0/share/icons/hicolor/128x128/apps/phonon-gstreamer.png'
collision between `/nix/store/zjrrnah6sbfn6wd2qdbs24yxnxk783bc-phonon-backend-gstreamer-qt5-4.9.0/share/icons/hicolor/16x16/apps/phonon-gstreamer.png' and `/nix/store/a8qrlxjvrb7lgykn1xivn1r5sm5cjzv8-phonon-backend-gstreamer-qt4-4.9.0/share/icons/hicolor/16x16/apps/phonon-gstreamer.png'
collision between `/nix/store/zjrrnah6sbfn6wd2qdbs24yxnxk783bc-phonon-backend-gstreamer-qt5-4.9.0/share/icons/hicolor/22x22/apps/phonon-gstreamer.png' and `/nix/store/a8qrlxjvrb7lgykn1xivn1r5sm5cjzv8-phonon-backend-gstreamer-qt4-4.9.0/share/icons/hicolor/22x22/apps/phonon-gstreamer.png'
collision between `/nix/store/zjrrnah6sbfn6wd2qdbs24yxnxk783bc-phonon-backend-gstreamer-qt5-4.9.0/share/icons/hicolor/48x48/apps/phonon-gstreamer.png' and `/nix/store/a8qrlxjvrb7lgykn1xivn1r5sm5cjzv8-phonon-backend-gstreamer-qt4-4.9.0/share/icons/hicolor/48x48/apps/phonon-gstreamer.png'
collision between `/nix/store/zjrrnah6sbfn6wd2qdbs24yxnxk783bc-phonon-backend-gstreamer-qt5-4.9.0/share/icons/hicolor/64x64/apps/phonon-gstreamer.png' and `/nix/store/a8qrlxjvrb7lgykn1xivn1r5sm5cjzv8-phonon-backend-gstreamer-qt4-4.9.0/share/icons/hicolor/64x64/apps/phonon-gstreamer.png'
collision between `/nix/store/zjrrnah6sbfn6wd2qdbs24yxnxk783bc-phonon-backend-gstreamer-qt5-4.9.0/share/icons/hicolor/scalable/apps/phonon-gstreamer.svgz' and `/nix/store/a8qrlxjvrb7lgykn1xivn1r5sm5cjzv8-phonon-backend-gstreamer-qt4-4.9.0/share/icons/hicolor/scalable/apps/phonon-gstreamer.svgz'
collision between `/nix/store/wyg33mdknsydrpw42fg0qcbc3nji71d4-e2fsprogs-1.42.13-bin/bin/compile_et' and `/nix/store/nlvvlckgwa9334zivl58zlszqxn512dz-krb5-1.14.3/bin/compile_et'
collision between `/nix/store/wyg33mdknsydrpw42fg0qcbc3nji71d4-e2fsprogs-1.42.13-bin/sbin/compile_et' and `/nix/store/nlvvlckgwa9334zivl58zlszqxn512dz-krb5-1.14.3/sbin/compile_et'
collision between `/nix/store/17n8xqwq597f0akbgh4mj0p31w4sb8ml-e2fsprogs-1.42.13-man/share/man/man1/compile_et.1.gz' and `/nix/store/nlvvlckgwa9334zivl58zlszqxn512dz-krb5-1.14.3/share/man/man1/compile_et.1.gz'
collision between `/nix/store/8rn45r9ndfq5h7mx58r35p2szky5ja6n-coreutils-8.25/share/man/man1/groups.1.gz' and `/nix/store/4rzjks9bamr3h2av862x20fzdhahq8b2-shadow-4.2.1-man/share/man/man1/groups.1.gz'
collision between `/nix/store/jdimx7xl7x4nhf059535ki2x6fhyb14g-netcat-gnu-0.7.1/bin/nc' and `/nix/store/jjqz8xdnji14mcgfw7cf6nmb5kfkpqyn-netcat-openbsd-1.105/bin/nc'
cannot open `/nix/store/rxg9aq5z3f2gq4v6mzbjl4n7pslzd6ay-xorg-server-1.18.3/share/X11/xkb/compiled/systemd-private-d7cda77702694c90bd73deb758ac1f6d-rtkit-daemon.service-nwPBtI': Permission denied at /nix/store/9g4wc31j7a2xp22xpgwr0qssfxahxdzl-builder.pl line 58.
builder for ‘/nix/store/3xl8l4vddvfqx0gyd9z3fgm0jr2by04a-system-path.drv’ failed with exit code 13
cannot build derivation ‘/nix/store/mpqrssb0kp9w7gw7ba9sp5w4a4ghbdx5-dbus-conf.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/bj59sz9q8prb8k9d60686grh80n0iqmv-unit-polkit.service.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/ik8s9nl1yp0kqmjyq7ln2sn0886wpqk0-xsession.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/6nq41xm72h8vyyh1a9f4hmqcya54zifz-desktops.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/6ksh6khm1zhbaaajrnz19xn0r7vkf8yr-unit-dbus.service.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/k9y41dpjgfrq5vs7z1i1dnczmg64bqia-unit-dbus.service.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/d0krvmfhy2h73zqflhj44bl06y0lf269-unit-display-manager.service.drv’: 2 dependencies couldn't be built
cannot build derivation ‘/nix/store/v86n65r1jwiwcmi2h1lsbnqmnbl9ac1a-user-units.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/vj3bk6bm300585n1ywbncryl5r6p9swc-system-units.drv’: 3 dependencies couldn't be built
cannot build derivation ‘/nix/store/9k4jxcmdab8mf3g4dc20wdhphj7pli44-etc.drv’: 4 dependencies couldn't be built
cannot build derivation ‘/nix/store/i9cy13a70fqq9h43kczvgvxq6rr3g1dc-nixos-system-ronny-ownpc-16.09.1098.6fe0069.drv’: 2 dependencies couldn't be built
error: build of ‘/nix/store/i9cy13a70fqq9h43kczvgvxq6rr3g1dc-nixos-system-ronny-ownpc-16.09.1098.6fe0069.drv’ failed

it seems to be triggered by enabling kde5