diff --git a/lib/customisation.nix b/lib/customisation.nix
index dc5dd7691976..37a7951896b0 100644
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -217,4 +217,31 @@ rec {
         };
     in self;
 
+  /* Like the above, but aims to support cross compilation. It's still ugly, but
+     hopefully it helps a little bit. */
+  makeScopeWithSplicing = splicePackages: newScope: otherSplices: keep: f:
+    let
+      spliced = splicePackages {
+        pkgsBuildBuild = otherSplices.selfBuildBuild;
+        pkgsBuildHost = otherSplices.selfBuildHost;
+        pkgsBuildTarget = otherSplices.selfBuildTarget;
+        pkgsHostHost = otherSplices.selfHostHost;
+        pkgsHostTarget = self; # Not `otherSplices.selfHostTarget`;
+        pkgsTargetTarget = otherSplices.selfTargetTarget;
+      } // keep self;
+      self = f self // {
+        newScope = scope: newScope (spliced // scope);
+        callPackage = newScope spliced; # == self.newScope {};
+        # N.B. the other stages of the package set spliced in are *not*
+        # overridden.
+        overrideScope = g: makeScopeWithSplicing
+          splicePackages
+          newScope
+          otherSplices
+          keep
+          (lib.fixedPoints.extends g f);
+        packages = f;
+      };
+    in self;
+
 }
diff --git a/lib/default.nix b/lib/default.nix
index e3c1ed713463..f985266ed938 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -101,7 +101,7 @@ let
       noDepEntry fullDepEntry packEntry stringAfter;
     inherit (self.customisation) overrideDerivation makeOverridable
       callPackageWith callPackagesWith extendDerivation hydraJob
-      makeScope;
+      makeScope makeScopeWithSplicing;
     inherit (self.meta) addMetaAttrs dontDistribute setName updateName
       appendToName mapDerivationAttrset setPrio lowPrio lowPrioSet hiPrio
       hiPrioSet;