disable sibling inclusion

Author: TeofilC

lib/load-cabal-plan.nix

@@ -159,7 +159,9 @@ in {
                       if pkgs.lib.hasPrefix ".${callProjectResults.src.origSubDir or ""}/" (p.pkg-src.path + "/")
                         then pkgs.lib.removePrefix ".${callProjectResults.src.origSubDir or ""}" p.pkg-src.path
                         else throw "Unexpected path ${p.pkg-src.path} expected it to start with .${callProjectResults.src.origSubDir or ""}"))));
-                    includeSiblings = true; # Filtering sibling dirs of the package dir is done in the
+                        includeSiblings = false; # we disable this because it is extremely slow
+
+                                            # Filtering sibling dirs of the package dir is done in the
                                             # component builder so that relative paths can be used to
                                             # reference project directories not in the package subDir.
                   };