diff --git a/pkgs/development/compilers/llvm/18/clang/default.nix b/pkgs/development/compilers/llvm/18/clang/default.nix
deleted file mode 100644
index 1e777c6132e4..000000000000
--- a/pkgs/development/compilers/llvm/18/clang/default.nix
+++ /dev/null
@@ -1,139 +0,0 @@
-{ lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
-, substituteAll, cmake, ninja, libxml2, libllvm, version, python3
-, buildLlvmTools
-, fixDarwinDylibNames
-, enableManpages ? false
-}:
-
-let
-  self = stdenv.mkDerivation (finalAttrs: rec {
-    pname = "clang";
-    inherit version;
-
-    src = runCommand "${pname}-src-${version}" {} ''
-      mkdir -p "$out"
-      cp -r ${monorepoSrc}/cmake "$out"
-      cp -r ${monorepoSrc}/${pname} "$out"
-      cp -r ${monorepoSrc}/clang-tools-extra "$out"
-    '';
-
-    sourceRoot = "${src.name}/${pname}";
-
-    nativeBuildInputs = [ cmake ninja python3 ]
-      ++ lib.optional (lib.versionAtLeast version "18" && enableManpages) python3.pkgs.myst-parser
-      ++ lib.optional enableManpages python3.pkgs.sphinx
-      ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
-
-    buildInputs = [ libxml2 libllvm ];
-
-    cmakeFlags = [
-      "-DCLANG_INSTALL_PACKAGE_DIR=${placeholder "dev"}/lib/cmake/clang"
-      "-DCLANGD_BUILD_XPC=OFF"
-      "-DLLVM_ENABLE_RTTI=ON"
-      "-DLLVM_INCLUDE_TESTS=OFF"
-    ] ++ lib.optionals enableManpages [
-      "-DCLANG_INCLUDE_DOCS=ON"
-      "-DLLVM_ENABLE_SPHINX=ON"
-      "-DSPHINX_OUTPUT_MAN=ON"
-      "-DSPHINX_OUTPUT_HTML=OFF"
-      "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++ lib.optionals (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
-      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
-      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
-      # Added in LLVM15:
-      # `clang-tidy-confusable-chars-gen`: https://github.com/llvm/llvm-project/commit/c3574ef739fbfcc59d405985a3a4fa6f4619ecdb
-      # `clang-pseudo-gen`: https://github.com/llvm/llvm-project/commit/cd2292ef824591cc34cc299910a3098545c840c7
-      "-DCLANG_TIDY_CONFUSABLE_CHARS_GEN=${buildLlvmTools.libclang.dev}/bin/clang-tidy-confusable-chars-gen"
-      "-DCLANG_PSEUDO_GEN=${buildLlvmTools.libclang.dev}/bin/clang-pseudo-gen"
-    ];
-
-    patches = [
-      ./purity.patch
-      # https://reviews.llvm.org/D51899
-      ./gnu-install-dirs.patch
-      ../../common/clang/add-nostdlibinc-flag.patch
-      (substituteAll {
-        src = ../../common/clang/clang-at-least-16-LLVMgold-path.patch;
-       libllvmLibdir = "${libllvm.lib}/lib";
-      })
-    ];
-
-    postPatch = ''
-      (cd tools && ln -s ../../clang-tools-extra extra)
-    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
-      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
-    '';
-
-    outputs = [ "out" "lib" "dev" "python" ];
-
-    postInstall = ''
-      ln -sv $out/bin/clang $out/bin/cpp
-
-      # Move libclang to 'lib' output
-      moveToOutput "lib/libclang.*" "$lib"
-      moveToOutput "lib/libclang-cpp.*" "$lib"
-      substituteInPlace $dev/lib/cmake/clang/ClangTargets-release.cmake \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
-
-      mkdir -p $python/bin $python/share/clang/
-      mv $out/bin/{git-clang-format,scan-view} $python/bin
-      if [ -e $out/bin/set-xcode-analyzer ]; then
-        mv $out/bin/set-xcode-analyzer $python/bin
-      fi
-      mv $out/share/clang/*.py $python/share/clang
-      rm $out/bin/c-index-test
-      patchShebangs $python/bin
-
-      mkdir -p $dev/bin
-      cp bin/{clang-tblgen,clang-tidy-confusable-chars-gen,clang-pseudo-gen} $dev/bin
-    '';
-
-    passthru = {
-      inherit libllvm;
-      isClang = true;
-      hardeningUnsupportedFlags = [
-        "fortify3"
-      ];
-      hardeningUnsupportedFlagsByTargetPlatform = targetPlatform:
-        lib.optional (!(targetPlatform.isx86_64 || targetPlatform.isAarch64)) "zerocallusedregs"
-        ++ (finalAttrs.passthru.hardeningUnsupportedFlags or []);
-    };
-
-    meta = llvm_meta // {
-      homepage = "https://clang.llvm.org/";
-      description = "A C language family frontend for LLVM";
-      longDescription = ''
-        The Clang project provides a language front-end and tooling
-        infrastructure for languages in the C language family (C, C++, Objective
-        C/C++, OpenCL, CUDA, and RenderScript) for the LLVM project.
-        It aims to deliver amazingly fast compiles, extremely useful error and
-        warning messages and to provide a platform for building great source
-        level tools. The Clang Static Analyzer and clang-tidy are tools that
-        automatically find bugs in your code, and are great examples of the sort
-        of tools that can be built using the Clang frontend as a library to
-        parse C/C++ code.
-      '';
-      mainProgram = "clang";
-    };
-  } // lib.optionalAttrs enableManpages {
-    pname = "clang-manpages";
-
-    ninjaFlags = [ "docs-clang-man" ];
-
-    installPhase = ''
-      mkdir -p $out/share/man/man1
-      # Manually install clang manpage
-      cp docs/man/*.1 $out/share/man/man1/
-    '';
-
-    outputs = [ "out" ];
-
-    doCheck = false;
-
-    meta = llvm_meta // {
-      description = "man page for Clang ${version}";
-    };
-  });
-in self