cross-compile python3.10 for aarch64-android

flake.nix

@@ -111,9 +111,6 @@
         '';
       };
     in {
-
-      packages.python = pkgs.pkgsCross.aarch64-android.tahoe-lafs;
-
       packages.apk = pkgs.androidenv.buildApp {
         name = "PrivateStorage Mobile";
         src = ./app;
@@ -153,6 +150,8 @@
 
         ANDROID_PLATFORM_VERSION = "${platformVersion}";
 
+        # https://nix.dev/tutorials/cross-compilation
+
         buildInputs = with pkgs; [
           gradle-wrapper
           ant
@@ -212,5 +211,43 @@
         nativeBuildInputs =
           with pkgs; getBuildInputs (drv: drv.nativeBuildInputs) [ openssl libffi python39 ];
       };
+    } // {
+      packages.aarch64-android.host-python310 = (pkgs.pkgsCross.aarch64-android.python310.override {
+        # Turn off all the things.  Each one might be broken for
+        # cross-compilation and even if not we don't need them for this build
+        # Python.  We just need it to report the right platform info.
+        mimetypesSupport = false;
+        x11Support = false;
+        bluezSupport = false;
+        sqlite = null;
+        openssl = null;
+        tzdata = null;
+        readline = null;
+      }).overrideAttrs (old: {
+        # Turn off even more things which aren't parameters to the Python
+        # expression.
+
+        # These drag in an aarch64-android bash which fails to build.
+        preFixup = null;
+        postPatch = null;
+
+        # This drags in a -lcrypt dependency which isn't satisfied by Google
+        # Android Bionic.
+        LIBS = null;
+      });
+
+      # packages.aarch64-android.zfec = self.packages.aarch64-android.host-python310.buildPythonPackage;
+        # let
+        #   build-python = pkgs.pkgsCross.${system}.python310;
+        #   host-python = pkgs.pkgsCross.aarch64-android.python310;
+
+        #   build-pyenv = build-python.withPackages (ps: [ (ps.callPackage ./crossenv.nix) ]);
+        # in
+        #   pkgs.mkDerivation {
+        #     name = "python3.10-zfec";
+        #     version = "2.3.4"; # XXX
+
+        #     src = fetchPypi
+        #   };
     });
 }