diff --git a/L/LLVMCompilerRT/build_tarballs.jl b/L/LLVMCompilerRT/build_tarballs.jl
index fff6e6b7256..61694983c56 100644
--- a/L/LLVMCompilerRT/build_tarballs.jl
+++ b/L/LLVMCompilerRT/build_tarballs.jl
@@ -1,6 +1,6 @@
 # Note that this script can accept some limited command-line arguments, run
 # `julia build_tarballs.jl --help` to see a usage message.
-using BinaryBuilder
+using BinaryBuilder, Pkg
 
 name = "LLVMCompilerRT"
 version = v"16.0.6"
@@ -14,6 +14,9 @@ sources = [
         "https://github.com/llvm/llvm-project/releases/download/llvmorg-$(version)/cmake-$(version).src.tar.xz",
         "39d342a4161095d2f28fb1253e4585978ac50521117da666e2b1f6f28b62f514"
     ),
+    ArchiveSource(
+        "https://github.com/phracker/MacOSX-SDKs/releases/download/10.15/MacOSX10.14.sdk.tar.xz",
+        "0f03869f72df8705b832910517b47dd5b79eb4e160512602f593ed243b28715f"),
     DirectorySource("./bundled"),
 ]
 
@@ -51,6 +54,10 @@ else
 fi
 EOF
 
+    # Building this needs a newer SDK
+    apple_sdk_root=$WORKSPACE/srcdir/MacOSX10.14.sdk
+    sed -i "s!/opt/x86_64-apple-darwin14/x86_64-apple-darwin14/sys-root!$apple_sdk_root!" $CMAKE_TARGET_TOOLCHAIN
+
     # We use could use `${MACOSX_DEPLOYMENT_TARGET}` to specify the SDK version, but it's
     # set to 10.10 on x86_64, but compiler-rt requires at least 10.12 and we actually use
     # 10.12.  On aarch64 it's 11.0, but the CMake script doesn't seem to like values greater
@@ -58,6 +65,7 @@ EOF
     FLAGS+=(
             -DDARWIN_macosx_OVERRIDE_SDK_VERSION:STRING=10.12
             -DDARWIN_macosx_CACHED_SYSROOT=/opt/${target}/${target}/sys-root
+            -DCMAKE_SYSROOT=$apple_sdk_root -DCMAKE_FRAMEWORK_PATH=$apple_sdk_root/System/Library/Frameworks
            )
 fi
 
@@ -83,14 +91,17 @@ platforms = supported_platforms()
 # some packages on aarch64-apple-darwin, so there is little need to spend time on getting
 # this to build for _all_ platforms.  The long-term plan is to have these libraries as part
 # of LLVMBootstrap: https://github.com/JuliaPackaging/Yggdrasil/pull/1681
-filter!(p -> arch(p) == "aarch64" && Sys.isapple(p), platforms)
+filter!(p -> arch(p) != "powerpc64le" && !(BinaryBuilder.proc_family(p) == "intel" && libc(p) == "musl"), platforms)
 
 # The products that we will ensure are always built
 products = LibraryProduct[
 ]
 
 # Dependencies that must be installed before this package can be built
-dependencies = Dependency[
+dependencies = [
+    Dependency("XML2_jll"),
+    Dependency("Zlib_jll"),
+    BuildDependency(PackageSpec(name="LLVM_full_jll"; version)),
 ]
 
 # Build the tarballs, and possibly a `build.jl` as well.