pspp: provide default icons & settings

psppire needs to be wrapped so that it will work outside of GNOME
desktop. We provide hicolor-icon-theme & gsettings-desktop-schemas.

Note that at runtime, I still get this error:

- Cannot create a converter for `IBM864' to `UTF-8': Invalid argument

Possibly a locale issue.

Fixes #40558

pkgs/applications/science/math/pspp/default.nix

@@ -1,5 +1,7 @@
 { stdenv, fetchurl, libxml2, readline, zlib, perl, cairo, gtk3, gsl
 , pkgconfig, gtksourceview, pango, gettext
+, makeWrapper, gsettings-desktop-schemas, hicolor-icon-theme
+, gnome3
 }:
 
 stdenv.mkDerivation rec {
@@ -12,12 +14,21 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
   buildInputs = [ libxml2 readline zlib perl cairo gtk3 gsl
-    gtksourceview pango gettext ];
+    gtksourceview pango gettext
+    makeWrapper gsettings-desktop-schemas hicolor-icon-theme ];
 
   doCheck = false;
 
   enableParallelBuilding = true;
 
+  preFixup = ''
+    wrapProgram "$out/bin/psppire" \
+     --prefix XDG_DATA_DIRS : "$out/share" \
+     --prefix XDG_DATA_DIRS : "$XDG_ICON_DIRS" \
+     --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH" \
+     --prefix GIO_EXTRA_MODULES : "${stdenv.lib.getLib gnome3.dconf}/lib/gio/modules"
+  '';
+
   meta = {
     homepage = http://www.gnu.org/software/pspp/;
     description = "A free replacement for SPSS, a program for statistical analysis of sampled data";