diff --git a/pkgs/applications/misc/onboard/default.nix b/pkgs/applications/misc/onboard/default.nix
index de2f86e9f9a..79e3317e64d 100644
--- a/pkgs/applications/misc/onboard/default.nix
+++ b/pkgs/applications/misc/onboard/default.nix
@@ -29,14 +29,22 @@
 }:
 
 let
-  customHunspell = hunspellWithDicts [hunspellDicts.en-us];
+
+  customHunspell = hunspellWithDicts [
+    hunspellDicts.en-us
+  ];
+
   majorVersion = "1.4";
+
+in
+
+python3.pkgs.buildPythonApplication rec {
+  pname = "onboard";
   version = "${majorVersion}.1";
-in python3.pkgs.buildPythonApplication rec {
-  name = "onboard-${version}";
+
   src = fetchurl {
-    url = "https://launchpad.net/onboard/${majorVersion}/${version}/+download/${name}.tar.gz";
-    sha256 = "01cae1ac5b1ef1ab985bd2d2d79ded6fc99ee04b1535cc1bb191e43a231a3865";
+    url = "https://launchpad.net/onboard/${majorVersion}/${version}/+download/${pname}-${version}.tar.gz";
+    sha256 = "0r9q38ikmr4in4dwqd8m9gh9xjbgxnfxglnjbfcapw8ybfnf3jh1";
   };
 
   patches = [
@@ -48,9 +56,42 @@ in python3.pkgs.buildPythonApplication rec {
     ./hunspell-use-xdg-datadirs.patch
   ];
 
-  # For tests
-  LC_ALL = "en_US.UTF-8";
-  doCheck = false;
+  nativeBuildInputs = [
+    gobject-introspection
+    intltool
+    pkgconfig
+    wrapGAppsHook
+  ];
+
+  buildInputs = [
+    bash
+    glib
+    gnome3.dconf
+    gsettings-desktop-schemas
+    gtk3
+    hunspell
+    isocodes
+    libcanberra-gtk3
+    libxkbcommon
+    mousetweaks
+    udev
+    xorg.libXtst
+    xorg.libxkbfile
+  ] ++ stdenv.lib.optional atspiSupport at-spi2-core;
+
+  propagatedBuildInputs = with python3.pkgs; [
+    dbus-python
+    distutils_extra
+    pyatspi
+    pycairo
+    pygobject3
+    systemd
+  ];
+
+  propagatedUserEnvPkgs = [
+    gnome3.dconf
+  ];
+
   checkInputs = [
     # for Onboard.SpellChecker.aspell_cmd doctests
     (aspellWithDicts (dicts: with dicts; [ en ]))
@@ -66,43 +107,10 @@ in python3.pkgs.buildPythonApplication rec {
     python3.pkgs.nose
   ];
 
-  propagatedBuildInputs = [
-    glib
-    python3
-    python3.pkgs.dbus-python
-    python3.pkgs.distutils_extra
-    python3.pkgs.pyatspi
-    python3.pkgs.pycairo
-    python3.pkgs.pygobject3
-    python3.pkgs.systemd
-  ];
+  # Temporary fix, see https://github.com/NixOS/nixpkgs/issues/56943
+  strictDeps = false;
 
-  buildInputs = [
-    bash
-    gnome3.dconf
-    gsettings-desktop-schemas
-    gtk3
-    hunspell
-    isocodes
-    libcanberra-gtk3
-    mousetweaks
-    udev
-    libxkbcommon
-    wrapGAppsHook
-    xorg.libXtst
-    xorg.libxkbfile
-  ] ++ stdenv.lib.optional atspiSupport at-spi2-core;
-
-  nativeBuildInputs = [
-    glibcLocales
-    gobject-introspection # populate GI_TYPELIB_PATH
-    intltool
-    pkgconfig
-  ];
-
-  propagatedUserEnvPkgs = [
-    gnome3.dconf
-  ];
+  doCheck = false;
 
   preBuild = ''
     # Unnecessary file, has been removed upstream
@@ -118,6 +126,9 @@ in python3.pkgs.buildPythonApplication rec {
 
     patchShebangs .
 
+    substituteInPlace setup.py \
+      --replace "/etc" "$out/etc"
+
     substituteInPlace  ./Onboard/LanguageSupport.py \
       --replace "/usr/share/xml/iso-codes" "${isocodes}/share/xml/iso-codes" \
       --replace "/usr/bin/yelp" "${yelp}/bin/yelp"
@@ -149,16 +160,22 @@ in python3.pkgs.buildPythonApplication rec {
       --replace '"killall",' '"${procps}/bin/pkill", "-x",'
   '';
 
-  postInstall = ''
-    cp onboard-default-settings.gschema.override.example $out/share/glib-2.0/schemas/10_onboard-default-settings.gschema.override
+  installPhase = ''
+    ${python3.interpreter} setup.py install --prefix="$out"
 
+    cp onboard-default-settings.gschema.override.example $out/share/glib-2.0/schemas/10_onboard-default-settings.gschema.override
     glib-compile-schemas $out/share/glib-2.0/schemas/
   '';
 
-  meta = {
+  # Remove ubuntu icons.
+  postFixup = ''
+    rm -rf  $out/share/icons/ubuntu-mono-*
+  '';
+
+  meta = with stdenv.lib; {
     homepage = https://launchpad.net/onboard;
-    description = "An onscreen keyboard useful for tablet PC users and for mobility impaired users.";
-    maintainers = with stdenv.lib.maintainers; [ johnramsden ];
-    license = stdenv.lib.licenses.gpl3;
+    description = "Onscreen keyboard useful for tablet PC users and for mobility impaired users";
+    maintainers = with maintainers; [ johnramsden ];
+    license = licenses.gpl3;
   };
 }