NixOS
diff --git a/nixos/modules/hardware/video/displaylink.nix b/nixos/modules/hardware/video/displaylink.nix
@@ -19,6 +19,21 @@ in
   config = mkIf enabled {
 
     boot.extraModulePackages = [ evdi ];
+    boot.kernelModules = [ "evdi" ];
+
+    environment.etc."X11/xorg.conf.d/40-displaylink.conf".text = ''
+      Section "OutputClass"
+        Identifier  "DisplayLink"
+        MatchDriver "evdi"
+        Driver      "modesetting"
+        Option      "AccelMethod" "none"
+      EndSection
+    '';
+
+    # make the device available
+    services.xserver.displayManager.sessionCommands = ''
+      ${lib.getBin pkgs.xorg.xrandr}/bin/xrandr --setprovideroutputsource 1 0
+    '';
 
     # Those are taken from displaylink-installer.sh and from Arch Linux AUR package.
 
@@ -47,18 +62,13 @@ in
       description = "DisplayLink Manager Service";
       after = [ "display-manager.service" ];
       conflicts = [ "getty@tty7.service" ];
-      path = [ pkgs.kmod ];
 
       serviceConfig = {
         ExecStart = "${displaylink}/bin/DisplayLinkManager";
         Restart = "always";
         RestartSec = 5;
+        LogsDirectory = "displaylink";
       };
-
-      preStart = ''
-        mkdir -p /var/log/displaylink
-        modprobe evdi
-      '';
     };
 
   };

diff --git a/pkgs/applications/audio/samplv1/default.nix b/pkgs/applications/audio/samplv1/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "samplv1";
-  version = "0.9.10";
+  version = "0.9.11";
 
   src = fetchurl {
     url = "mirror://sourceforge/samplv1/${pname}-${version}.tar.gz";
-    sha256 = "04p5jkighmc8rf7fzzy8ch6knqbxv03vhjzdfh9dva2mlzw9rvjj";
+    sha256 = "17zs8kvvwqv00bm4lxpn09a5hxjlbz7k5mkl3k7jspw7rqn3djf2";
   };
 
   buildInputs = [ libjack2 alsaLib liblo libsndfile lv2 qt5.qtbase qt5.qttools];

diff --git a/pkgs/applications/editors/quilter/default.nix b/pkgs/applications/editors/quilter/default.nix
@@ -4,13 +4,13 @@
 
 stdenv.mkDerivation rec {
   pname = "quilter";
-  version = "2.0.0";
+  version = "2.0.2";
 
   src = fetchFromGitHub {
     owner = "lainsce";
     repo = pname;
     rev = version;
-    sha256 = "1jmgnmpalnl3261wifk0mqa9viag6yvlrycgzqalmnrm1b20pyg4";
+    sha256 = "0qd8qssqzds06l08f4yf39i3bjl1ljyr85wgc3yn6mn698ynx30g";
   };
 
   nativeBuildInputs = [

diff --git a/pkgs/applications/graphics/inkscape/default.nix b/pkgs/applications/graphics/inkscape/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, pkgconfig, perlPackages, libXft
 , libpng, zlib, popt, boehmgc, libxml2, libxslt, glib, gtkmm2
 , glibmm, libsigcxx, lcms, boost, gettext, makeWrapper
-, gsl, python2, poppler, imagemagick, libwpg, librevenge
+, gsl, gtkspell2, python2, poppler, imagemagick, libwpg, librevenge
 , libvisio, libcdr, libexif, potrace, cmake
 , librsvg, wrapGAppsHook
 }:
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     librsvg # for loading icons
 
     python2Env perlPackages.perl
-  ];
+  ] ++ stdenv.lib.optional (!stdenv.isDarwin) gtkspell2;
 
   enableParallelBuilding = true;
 
@@ -62,9 +62,6 @@ stdenv.mkDerivation rec {
     install_name_tool -change $out/lib/libinkscape_base.dylib $out/lib/inkscape/libinkscape_base.dylib $out/bin/inkview
   '';
 
-  # 0.92.3 complains about an invalid conversion from const char * to char *
-  NIX_CFLAGS_COMPILE = " -fpermissive ";
-
   meta = with stdenv.lib; {
     license = "GPL";
     homepage = https://www.inkscape.org;

diff --git a/pkgs/applications/misc/cura/lulzbot/curaengine.nix b/pkgs/applications/misc/cura/lulzbot/curaengine.nix
@@ -2,7 +2,7 @@
 
 stdenv.mkDerivation rec {
   pname = "curaengine-lulzBot";
-  version = "3.6.18";
+  version = "3.6.21";
 
   src = fetchgit {
     url = https://code.alephobjects.com/source/curaengine-lulzbot.git;

diff --git a/pkgs/applications/misc/cura/lulzbot/default.nix b/pkgs/applications/misc/cura/lulzbot/default.nix
@@ -1,45 +1,44 @@
-{ lib, callPackage, fetchgit, cmake, jq, python3Packages, qtbase, qtquickcontrols2 }:
+{ lib, mkDerivation, wrapQtAppsHook, callPackage, fetchgit, cmake, jq, python3, qtbase, qtquickcontrols2 }:
 
 let
   # admittedly, we're using (printer firmware) blobs when we could compile them ourselves.
-  curaBinaryDataVersion = "3.6.18"; # Marlin v2.0.0.144. Keep this accurate wrt. the below.
+  curaBinaryDataVersion = "3.6.21"; # Marlin v2.0.0.174 for Bio, v2.0.0.144 for others.
   curaBinaryData = fetchgit {
     url = https://code.alephobjects.com/diffusion/CBD/cura-binary-data.git;
-    rev = "cdc046494bbfe1f65bfb34659a257eef9a0100a0";
-    sha256 = "0v0s036gxdjiglas2yzw95alv60sw3pq5k1zrrhmw9mxr4irrblb";
+    rev = "5c75d0f6c10d8b7a903e2072a48cd1f08059509e";
+    sha256 = "1qdsj6rczwzdwzyr7nz7fnypbphckjrnwl8c9dr6izsxyzs465c4";
   };
 
   libarcusLulzbot = callPackage ./libarcus.nix {
-    inherit (python3Packages) buildPythonPackage sip pythonOlder;
+    inherit (python3.pkgs) buildPythonPackage sip pythonOlder;
   };
   libsavitarLulzbot = callPackage ./libsavitar.nix {
-    inherit (python3Packages) buildPythonPackage sip pythonOlder;
+    inherit (python3.pkgs) buildPythonPackage sip pythonOlder;
   };
 
-  inherit (python3Packages) buildPythonPackage pyqt5 numpy scipy shapely pythonOlder;
+  inherit (python3.pkgs) buildPythonPackage pyqt5 numpy scipy shapely pythonOlder;
   curaengine = callPackage ./curaengine.nix {
     inherit libarcusLulzbot;
   };
   uraniumLulzbot = callPackage ./uranium.nix {
     inherit callPackage libarcusLulzbot;
-    inherit (python3Packages) buildPythonPackage pyqt5 numpy scipy shapely pythonOlder;
+    inherit (python3.pkgs) buildPythonPackage pyqt5 numpy scipy shapely pythonOlder;
   };
 in
-python3Packages.buildPythonApplication rec {
-  name = "cura-lulzbot-${version}";
-  version = "3.6.18";
+mkDerivation rec {
+  pname = "cura-lulzbot";
+  version = "3.6.21";
 
   src = fetchgit {
     url = https://code.alephobjects.com/source/cura-lulzbot.git;
-    rev = "71f1ac5a2b9f535175a3858a565930348358a9ca";
-    sha256 = "0by06fpxvdgy858lwhsccbmvkdq67j2s1cz8v6jnrnjrsxk7vzka";
+    rev = "7faeb18604c83004846a02c60cb240708db0034f";
+    sha256 = "10q38s8c8x6xkh1vns4p3iqa5y267vrjh5vq8h55mg1q5001scyq";
   };
 
-  format = "other"; # using cmake to build
   buildInputs = [ qtbase qtquickcontrols2 ];
   # numpy-stl temporarily disabled due to https://code.alephobjects.com/T8415
-  propagatedBuildInputs = with python3Packages; [ pyserial requests zeroconf ] ++ [ libsavitarLulzbot uraniumLulzbot libarcusLulzbot ]; # numpy-stl
-  nativeBuildInputs = [ cmake python3Packages.wrapPython ];
+  propagatedBuildInputs = with python3.pkgs; [ pyserial requests zeroconf ] ++ [ libsavitarLulzbot uraniumLulzbot libarcusLulzbot ]; # numpy-stl
+  nativeBuildInputs = [ cmake python3.pkgs.wrapPython ];
 
   cmakeFlags = [
     "-DURANIUM_DIR=${uraniumLulzbot.src}"
@@ -68,6 +67,11 @@ python3Packages.buildPythonApplication rec {
     EOF
   '';
 
+  postFixup = ''
+    wrapPythonPrograms
+    wrapQtApp "$out/bin/cura-lulzbot"
+  '';
+
   meta = with lib; {
     description = "3D printer / slicing GUI built on top of the Uranium framework";
     homepage = https://code.alephobjects.com/diffusion/CURA/;

diff --git a/pkgs/applications/misc/cura/lulzbot/libarcus.nix b/pkgs/applications/misc/cura/lulzbot/libarcus.nix
@@ -2,13 +2,13 @@
 
 buildPythonPackage {
   pname = "libarcus";
-  version = "3.6.18";
+  version = "3.6.21";
   format = "other";
 
   src = fetchgit {
     url = https://code.alephobjects.com/source/arcus.git;
-    rev = "c795c0644591703ce04e1fd799fc97b1539031aa";
-    sha256 = "1yap9wbqxbjx3kqyqcsldny4mlcm33ywiwpdjlfgs0wjahfg4ip0";
+    rev = "aeda02d7727f45b657afb72cef203283fbf09325";
+    sha256 = "1ak0d4k745sx7paic27was3s4987z9h3czscjs21hxbi6qy83g99";
   };
 
   disabled = pythonOlder "3.4.0";

diff --git a/pkgs/applications/misc/cura/lulzbot/libsavitar.nix b/pkgs/applications/misc/cura/lulzbot/libsavitar.nix
@@ -3,13 +3,13 @@
 buildPythonPackage {
   pname = "libsavitar-lulzbot";
   name = "libsavitar-lulzbot";
-  version = "3.6.18";
+  version = "3.6.21";
   format = "other";
 
   src = fetchgit {
     url = https://code.alephobjects.com/source/savitar.git;
-    rev = "988a26d35b2a1d042f8c38938ccda77ab146af7d";
-    sha256 = "146agw3a92azkgs5ahmn2rrck4an78m2r3pcss6ihmb60lx165k7";
+    rev = "ee8ada42c55f54727ce4d275c294ba426d3d8234";
+    sha256 = "1wm5ii3cmni8dk3c65kw4wglpypkdsfpgd480d3hc1r5bqpq0d6j";
   };
 
   postPatch = ''

diff --git a/pkgs/applications/misc/cura/lulzbot/uranium-qt512-support.patch b/pkgs/applications/misc/cura/lulzbot/uranium-qt512-support.patch
diff --git a/pkgs/applications/misc/cura/lulzbot/uranium.nix b/pkgs/applications/misc/cura/lulzbot/uranium.nix
@@ -2,15 +2,15 @@
 , pyqt5, numpy, scipy, shapely, libarcusLulzbot, doxygen, gettext, pythonOlder }:
 
 buildPythonPackage {
-  version = "3.6.18";
+  version = "3.6.21";
   pname = "uranium";
   name = "uraniumLulzbot";
   format = "other";
 
   src = fetchgit {
     url = https://code.alephobjects.com/diffusion/U/uranium.git;
-    rev = "33df88a7414375ac924ac761113baa48d2ced2b4";
-    sha256 = "109cbv7y105crbrzfp70lmcr9n20ap5c97i5qd46fmxbx86yj7f8";
+    rev = "54d911edd2551c5875c554928896122835a0dd6c";
+    sha256 = "04bym3vwikaxw8ab0mymv9sc9n8i7yw5kfsv99ic811g9lzz3j1i";
   };
 
   disabled = pythonOlder "3.5.0";
@@ -19,9 +19,6 @@ buildPythonPackage {
   propagatedBuildInputs = [ pyqt5 numpy scipy shapely libarcusLulzbot ];
   nativeBuildInputs = [ cmake doxygen ];
 
-  # Qt 5.12+ support; see https://code.alephobjects.com/rU70b73ba0a270799b9eacf78e400aa8b8ab3fb2ee
-  patches = [ ./uranium-qt512-support.patch ];
-
   postPatch = ''
     sed -i 's,/python''${PYTHON_VERSION_MAJOR}/dist-packages,/python''${PYTHON_VERSION_MAJOR}.''${PYTHON_VERSION_MINOR}/site-packages,g' CMakeLists.txt
     sed -i \

diff --git a/pkgs/applications/misc/pytrainer/default.nix b/pkgs/applications/misc/pytrainer/default.nix
@@ -26,13 +26,13 @@ in
 
 python3.pkgs.buildPythonApplication rec {
   pname = "pytrainer";
-  version = "2.0.0";
+  version = "2.0.1";
 
   src = fetchFromGitHub {
     owner = "pytrainer";
     repo = "pytrainer";
     rev = "v${version}";
-    sha256 = "1w5z1xwb2g6j2izm89b7lv9n92r1zhsr8bglxcn7jc5gwbvwysvd";
+    sha256 = "0m2sy3f5pyc4wv1ns31r7vlafqkzp0a2jasaskwrkl6273agbbk9";
   };
 
   patches = [