feat: xformers support

README.md

@@ -22,6 +22,12 @@ You might want to switch to high performance mode on battery-powered devices.
 This is just a Nix shell for bootstrapping the web UI, not an actual pure flake; the `./webui.sh` will still install
 a bunch of Python packages (into a venv, so not polluting your system) when you run it.
 
+
+## Troubleshooting 
+
+### xformers
+Run `./webui.sh --xformers` to set up xformers. If this command fails, try git pulling from the source repository, then deleting the venv (`rm -r venv`) and reinstalling everything from scratch again (sometimes the venv will keep old packages around forever even if they should be updated.)
+
 ## Credits
 - AUTOMATIC1111 for obvious reasons.
 - rprospero for [ROCm support](https://github.com/virchau13/automatic1111-webui-nix/pull/3).

impl.nix

@@ -13,6 +13,9 @@ let
       xorg.libXv
       xorg.libXrandr
       zlib
+      
+      # for xformers
+      gcc
     ] else [
       rocm-runtime
       pciutils
@@ -33,8 +36,8 @@ pkgs.mkShell rec {
         procps gnumake util-linux m4 gperf unzip
         libGLU libGL
         glib
-    ];
-    LD_LIBRARY_PATH=pkgs.lib.makeLibraryPath buildInputs;
+      ];
+    LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
     CUDA_PATH = pkgs.lib.optionalString isCUDA pkgs.cudatoolkit;
     EXTRA_LDFLAGS = pkgs.lib.optionalString isCUDA "-L${pkgs.linuxPackages.nvidia_x11}/lib";
 }