Merge pull request #85460 from chkno/k3d

k3d: Fix build: Use the same GCC version for boost dependency

pkgs/top-level/all-packages.nix

@@ -20212,7 +20212,13 @@ in
   k3d = callPackage ../applications/graphics/k3d {
     inherit (pkgs.gnome2) gtkglext;
     stdenv = gcc6Stdenv;
-    boost = boost155.override { enablePython = true; };
+    boost = boost155.override {
+      enablePython = true;
+      stdenv = gcc6Stdenv;
+      buildPackages = buildPackages // {
+        stdenv = gcc6Stdenv;
+      };
+    };
   };
 
   k3s = callPackage ../applications/networking/cluster/k3s {};