diff --git a/pkgs/development/interpreters/python/hooks/default.nix b/pkgs/development/interpreters/python/hooks/default.nix
index ca70d452c8087..f6e20973437ce 100644
--- a/pkgs/development/interpreters/python/hooks/default.nix
+++ b/pkgs/development/interpreters/python/hooks/default.nix
@@ -3,7 +3,7 @@ self: dontUse: with self;
 let
   inherit (python) pythonOnBuildForHost;
   inherit (pkgs) runCommand;
-  pythonInterpreter = pythonOnBuildForHost.interpreter;
+  pythonInterpreter = python.interpreter;
   pythonSitePackages = python.sitePackages;
   pythonCheckInterpreter = python.interpreter;
   setuppy = ../run_setup.py;
@@ -74,7 +74,7 @@ in {
         inherit pythonOnBuildForHost;
       };
     } ./pypa-build-hook.sh) {
-      inherit (pythonOnBuildForHost.pkgs) build;
+      inherit build;
     };
 
   pipInstallHook = callPackage ({ makePythonHook, pip }:
@@ -94,7 +94,7 @@ in {
         inherit pythonInterpreter pythonSitePackages;
       };
     } ./pypa-install-hook.sh) {
-      inherit (pythonOnBuildForHost.pkgs) installer;
+      inherit installer;
     };
 
   pytestCheckHook = callPackage ({ makePythonHook, pytest }:
@@ -237,16 +237,14 @@ in {
       propagatedBuildInputs = [ wheel ];
     } ./wheel-unpack-hook.sh) {};
 
-  wrapPython = callPackage ../wrap-python.nix {
-    inherit (pkgs.buildPackages) makeWrapper;
-  };
+  wrapPython = callPackage ../wrap-python.nix { };
 
   sphinxHook = callPackage ({ makePythonHook, installShellFiles }:
     makePythonHook {
       name = "python${python.pythonVersion}-sphinx-hook";
-      propagatedBuildInputs = [ pythonOnBuildForHost.pkgs.sphinx installShellFiles ];
+      propagatedBuildInputs = [ sphinx installShellFiles ];
       substitutions = {
-        sphinxBuild = "${pythonOnBuildForHost.pkgs.sphinx}/bin/sphinx-build";
+        sphinxBuild = "${sphinx}/bin/sphinx-build";
       };
     } ./sphinx-hook.sh) {};
 }
diff --git a/pkgs/development/interpreters/python/mk-python-derivation.nix b/pkgs/development/interpreters/python/mk-python-derivation.nix
index d75fea0eaef14..35a86a43fcfef 100644
--- a/pkgs/development/interpreters/python/mk-python-derivation.nix
+++ b/pkgs/development/interpreters/python/mk-python-derivation.nix
@@ -26,7 +26,7 @@
 , eggUnpackHook
 , eggBuildHook
 , eggInstallHook
-}:
+}@things:
 
 let
   inherit (builtins) unsafeGetAttrPos;
@@ -262,7 +262,7 @@ let
       setuptoolsBuildHook
     ] ++ optionals (format' == "pyproject") [(
       if isBootstrapPackage then
-        pypaBuildHook.override {
+        python.pythonOnBuildForHost.pkgs.pypaBuildHook.override {
           inherit (python.pythonOnBuildForHost.pkgs.bootstrap) build;
           wheel = null;
         }
@@ -270,7 +270,7 @@ let
         pypaBuildHook
     ) (
       if isBootstrapPackage then
-        pythonRuntimeDepsCheckHook.override {
+        python.pythonOnBuildForHost.pkgs.pythonRuntimeDepsCheckHook.override {
           inherit (python.pythonOnBuildForHost.pkgs.bootstrap) packaging;
         }
       else
@@ -281,7 +281,7 @@ let
       eggUnpackHook eggBuildHook eggInstallHook
     ] ++ optionals (format' != "other") [(
       if isBootstrapInstallPackage then
-        pypaInstallHook.override {
+        python.pythonOnBuildForHost.pkgs.pypaInstallHook.override {
           inherit (python.pythonOnBuildForHost.pkgs.bootstrap) installer;
         }
       else
@@ -324,7 +324,7 @@ let
 
     outputs = outputs ++ optional withDistOutput "dist";
 
-    inherit passthru;
+    passthru = { inherit things; } // passthru;
 
     meta = {
       # default to python's platforms
diff --git a/pkgs/development/interpreters/python/passthrufun.nix b/pkgs/development/interpreters/python/passthrufun.nix
index b06433113b6b3..5a577d6377d2a 100644
--- a/pkgs/development/interpreters/python/passthrufun.nix
+++ b/pkgs/development/interpreters/python/passthrufun.nix
@@ -47,7 +47,7 @@
         selfTargetTarget = pythonOnTargetForTarget.pkgs or {}; # There is no Python TargetTarget.
       };
       hooks = import ./hooks/default.nix;
-      keep = self: hooks self {};
+      keep = _: { };
       optionalExtensions = cond: as: lib.optionals cond as;
       pythonExtension = import ../../../top-level/python-packages.nix;
       python2Extension = import ../../../top-level/python2-packages.nix;
diff --git a/pkgs/development/interpreters/python/wrap-python.nix b/pkgs/development/interpreters/python/wrap-python.nix
index 8817d091a283a..6bffd67c32147 100644
--- a/pkgs/development/interpreters/python/wrap-python.nix
+++ b/pkgs/development/interpreters/python/wrap-python.nix
@@ -1,15 +1,33 @@
 { lib
 , python
 , makePythonHook
-, makeWrapper }:
+, makeWrapper
+, stdenv
+, targetPackages
+}:
 
 makePythonHook {
       name = "wrap-python-hook";
       propagatedBuildInputs = [ makeWrapper ];
       substitutions.sitePackages = python.sitePackages;
       substitutions.executable = python.interpreter;
-      substitutions.python = python.pythonOnBuildForHost;
-      substitutions.pythonHost = python;
+      substitutions.python = python;
+      #substitutions.pythonHost =
+      #if ((targetPackages.stdenv.buildPlatform != targetPackages.stdenv.targetPlatform) && (targetPackages.stdenv.hostPlatform == targetPackages.stdenv.targetPlatform))
+      #  then python.__spliced.hostHost
+      #else if (stdenv.buildPlatform != (stdenv.hostPlatform == stdenv.targetPlatform))
+      #  then python
+      #else if (stdenv.hostPlatform != stdenv.targetPlatform)
+      #  then python.__spliced.hostHost
+      #else throw "don't reach";
+      substitutions.pythonHost =
+      if ((targetPackages.stdenv.buildPlatform != targetPackages.stdenv.targetPlatform) && (targetPackages.stdenv.hostPlatform == targetPackages.stdenv.targetPlatform))
+        then python.__spliced.hostHost
+      else python;
+      passthru = {
+        python1 = python;
+        targetstdenv = targetPackages.stdenv;
+      };
       substitutions.magicalSedExpression = let
         # Looks weird? Of course, it's between single quoted shell strings.
         # NOTE: Order DOES matter here, so single character quotes need to be
diff --git a/pkgs/misc/flashfocus/default.nix b/pkgs/misc/flashfocus/default.nix
index 8c7fb067f1ab0..3905d8a6d2bf5 100644
--- a/pkgs/misc/flashfocus/default.nix
+++ b/pkgs/misc/flashfocus/default.nix
@@ -38,6 +38,10 @@ python3Packages.buildPythonApplication rec {
   # Tests require access to a X session
   doCheck = false;
 
+  preFixup = ''
+    set -x
+  '';
+
   pythonImportsCheck = [ "flashfocus" ];
 
   passthru.updateScript = nix-update-script { };