home: add xdg_data_home to session vars

hugin crashes if this is undefined

home/default.nix

@@ -31,5 +31,6 @@
     BROWSER = "firefox";
     # FIXME: only set if gpg-agent not in use, otherwise home manager already does that
     SSH_AUTH_SOCK = "$(${gpgPackage}/bin/gpgconf --list-dirs agent-ssh-socket)";
+    XDG_DATA_HOME = "$HOME/.local/share";
   };
 }

hosts/boreal/home.nix

@@ -20,6 +20,8 @@
         
         chromium
         darktable
+        hugin
+        enblend-enfuse
         # dev
         
         rustup

overlays/default.nix

@@ -1,4 +1,5 @@
 {
   i3status-rust = import ./i3status-rust;
   chrysalis = import ./chrysalis;
+  hugin = import ./hugin;
 }

overlays/hugin/default.nix

@@ -0,0 +1,34 @@
+final: prev: {
+  # hugin needs glew-egl since wxGTK30 upgrade:
+  # https://bugs.archlinux.org/task/75406
+  hugin = prev.hugin.overrideAttrs (oldAttrs: {
+    buildInputs = with final; [
+      boost
+      cairo
+      exiv2
+      fftw
+      flann
+      gettext
+      glew
+      ilmbase
+      lcms2
+      lensfun
+      libjpeg
+      libpng
+      libtiff
+      xorg.libX11
+      xorg.libXi
+      xorg.libXmu
+      libGLU
+      libGL
+      openexr
+      panotools
+      sqlite
+      vigra
+      (wxGTK31.override {
+        withEGL = false;
+      })
+      zlib
+    ];
+  });
+}