diff --git a/C/Cling/build_tarballs.jl b/C/Cling/build_tarballs.jl
new file mode 100644
index 00000000000..cc322a2aa90
--- /dev/null
+++ b/C/Cling/build_tarballs.jl
@@ -0,0 +1,137 @@
+# Note that this script can accept some limited command-line arguments, run
+# `julia build_tarballs.jl --help` to see a usage message.
+using BinaryBuilder, Pkg
+
+# Cling is an interactive C++ interpreter,
+# built on the top of LLVM and Clang libraries.
+# https://root.cern/cling
+
+name = "Cling"
+version = v"0.9.0"
+
+# Collection of sources required to complete build
+# Cling requires CERN's patched versions of llvm and clang.
+sources = [
+    GitSource("http://root.cern/git/llvm.git",
+              "859a19cc70aba64df3a20f1b91c84b81547bbf24"), # tag: cling-v0.9
+    GitSource("http://root.cern/git/clang.git",
+              "0e0d27eb409f64af84cc6a85c2fb48d2b5ce8122"), # tag: cling-v0.9
+    GitSource("http://root.cern/git/cling.git",
+              "646e3f59550b6a24d81edde5694844a1a8c3fdf4"), # tag: v0.9
+    DirectorySource("./bundled"),
+]
+
+# Bash recipe for building across all platforms
+# Cling Build Instructions: https://root.cern/cling/cling_build_instructions/
+# Cling Homebrew Formula: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/cling.rb
+script = raw"""
+cd $WORKSPACE/srcdir
+mv llvm/ src
+mv clang/ src/tools/
+mv cling/ src/tools/
+
+LLVM_SRCDIR=$(pwd)/src
+
+# Patch to work-around missing clang runtime lib
+# (undefined symbol ___isPlatformVersionAtLeast).
+# See: https://github.com/JuliaPackaging/Yggdrasil/pull/5937#issuecomment-1334463175
+pushd ${LLVM_SRCDIR}
+atomic_patch -p1 ${WORKSPACE}/srcdir/patches/*
+popd
+
+cp src/LICENSE.TXT LICENSE_LLVM.TXT 
+cp src/tools/clang/LICENSE.TXT LICENSE_CLANG.TXT 
+cp src/tools/cling/LICENSE.TXT LICENSE_CLING.TXT 
+install_license LICENSE_LLVM.TXT 
+install_license LICENSE_CLANG.TXT 
+install_license LICENSE_CLING.TXT 
+
+# The very first thing we need to do is to build llvm-tblgen for x86_64-linux-muslc
+# This is because LLVM's cross-compile setup is kind of borked, so we just
+# build the tools natively ourselves, directly.  :/
+# See: https://github.com/JuliaPackaging/Yggdrasil/blob/86a4221f71ee8ca5c0fd1056829a1fe2b28c879b/M/Metal_LLVM_Tools/build_tarballs.jl#L35
+
+# Build llvm-tblgen and llvm-config
+mkdir ${WORKSPACE}/bootstrap
+pushd ${WORKSPACE}/bootstrap
+CMAKE_FLAGS=()
+CMAKE_FLAGS+=(-DLLVM_HOST_TRIPLE=${MACHTYPE})
+CMAKE_FLAGS+=(-DCMAKE_BUILD_TYPE=Release)
+CMAKE_FLAGS+=(-DLLVM_TARGETS_TO_BUILD="host;NVPTX")
+CMAKE_FLAGS+=(-DCMAKE_TOOLCHAIN_FILE=${CMAKE_HOST_TOOLCHAIN})
+CMAKE_FLAGS+=(-DCMAKE_CROSSCOMPILING=OFF)
+cmake -GNinja ${LLVM_SRCDIR} ${CMAKE_FLAGS[@]}
+ninja -j${nproc} llvm-tblgen clang-tblgen llvm-config
+popd
+
+# Let's do the actual build within the `build` subdirectory
+mkdir ${WORKSPACE}/build
+cd ${WORKSPACE}/build
+
+CMAKE_FLAGS=()
+
+# Tell LLVM where our pre-built tblgen tools are
+CMAKE_FLAGS+=(-DLLVM_TABLEGEN=${WORKSPACE}/bootstrap/bin/llvm-tblgen)
+CMAKE_FLAGS+=(-DCLANG_TABLEGEN=${WORKSPACE}/bootstrap/bin/clang-tblgen)
+CMAKE_FLAGS+=(-DLLVM_CONFIG_PATH=${WORKSPACE}/bootstrap/bin/llvm-config)
+
+# Install things into $prefix
+CMAKE_FLAGS+=(-DCMAKE_INSTALL_PREFIX=${prefix})
+
+# Explicitly use our cmake toolchain file and tell CMake we're cross-compiling
+CMAKE_FLAGS+=(-DCMAKE_TOOLCHAIN_FILE=${CMAKE_TARGET_TOOLCHAIN})
+CMAKE_FLAGS+=(-DCMAKE_CROSSCOMPILING=ON)
+
+if [[ "${target}" == *apple* ]]; then
+    # Without this, cling will try to call `x86_64-apple-darwin14-clang++`
+    # on the macOS machine to find C++ header locations.
+    CMAKE_FLAGS+=(-DCLING_CXX_PATH=clang++)
+fi
+
+# Release build for best performance
+CMAKE_FLAGS+=(-DCMAKE_BUILD_TYPE=Release)
+
+cmake -GNinja ${LLVM_SRCDIR} ${CMAKE_FLAGS[@]}
+ninja -j${nproc} \
+    tools/cling/install \
+    install-clang-resource-headers
+"""
+
+# These are the platforms we will build for by default, unless further
+# platforms are passed in on the command line
+platforms = supported_platforms(;exclude=x->
+    startswith(arch(x), r"arm|power") ||
+    Sys.isfreebsd(x) ||
+    Sys.iswindows(x) ||
+    (Sys.isapple(x) && arch(x) == "aarch64"))
+    # FreeBSD build failed with:
+    #   libc.so.7: undefined reference to `__progname', `environ`
+    #
+    # Windows build failed with:
+    #   TCHAR.H, Shlwapi.h: No such file or directory
+    #
+    # aarch64 macOS failed with:
+    #   The C compiler is not able to compile a simple test program.
+    #
+    # Failed build Logs:
+    # https://dev.azure.com/JuliaPackaging/Yggdrasil/_build/results?buildId=23989&view=results
+platforms = expand_cxxstring_abis(platforms)
+
+# The products that we will ensure are always built
+products = [
+    LibraryProduct("libcling", :libcling),
+    ExecutableProduct("cling", :cling)
+]
+
+# Dependencies that must be installed before this package can be built
+dependencies = Dependency[
+]
+
+# Build the tarballs, and possibly a `build.jl` as well.
+# Compiler versions taken from here:
+# https://github.com/JuliaPackaging/Yggdrasil/blob/master/L/LLVM/LLVM_full%409.0.1/build_tarballs.jl
+build_tarballs(
+    ARGS, name, version, sources, script, platforms, products, dependencies;
+    julia_compat="1.6",
+    preferred_gcc_version=v"7",
+    preferred_llvm_version=v"8")
diff --git a/C/Cling/bundled/patches/avoid_builtin_available.patch b/C/Cling/bundled/patches/avoid_builtin_available.patch
new file mode 100644
index 00000000000..8e74f2ded31
--- /dev/null
+++ b/C/Cling/bundled/patches/avoid_builtin_available.patch
@@ -0,0 +1,13 @@
+diff --git a/lib/Support/Unix/Path.inc b/lib/Support/Unix/Path.inc
+index 27c8a1bc9b7..11f2cc518d0 100644
+--- a/lib/Support/Unix/Path.inc
++++ b/lib/Support/Unix/Path.inc
+@@ -1201,7 +1201,7 @@ namespace fs {
+ std::error_code copy_file(const Twine &From, const Twine &To) {
+   uint32_t Flag = COPYFILE_DATA;
+ #if __has_builtin(__builtin_available) && defined(COPYFILE_CLONE)
+-  if (__builtin_available(macos 10.12, *)) {
++  {
+     bool IsSymlink;
+     if (std::error_code Error = is_symlink_file(From, IsSymlink))
+       return Error;