diff --git a/build-clang-5.0.1.sh b/build-clang-5.0.1.sh
new file mode 100755
index 0000000..565157e
--- /dev/null
+++ b/build-clang-5.0.1.sh
@@ -0,0 +1,143 @@
+#!/bin/bash
+
+if ! hash xz; then
+  cat >&2 <<EOF
+'xz' is required to run this script. You may have to install it using your
+operating system's package manager.
+EOF
+  exit 1
+fi
+
+set -euxo pipefail
+
+LLVM_VERSION='5.0.1'
+CORRESPONDING_CLANG_BIN_VERSION='5.0'
+LLVM_RELEASE_BUILD_DIRNAME='llvm-tmp'
+LLVM_PANTS_ARCHIVE_NAME='clang.tar.gz'
+CLANG_SUPPORTDIR='build-support/bin/clang'
+
+mkdir -p "$LLVM_RELEASE_BUILD_DIRNAME"
+
+CLANG_BINARIES=(
+  clang
+  clang++
+  clang-"${CORRESPONDING_CLANG_BIN_VERSION}"
+)
+
+function extract-required-files-from-unpacked-llvm {
+  local -r unpacked_llvm_dir="$1"
+  local -r pants_output_archive_name="$2"
+
+  mkdir -p bin/ include/
+
+  for bin_path in ${CLANG_BINARIES[@]}; do
+    cp "${unpacked_llvm_dir}/bin/${bin_path}" bin/
+  done
+
+  # Copy over the C standard library headers into the include/ subdir. We will
+  # include the C++ standard library headers in a separate subdirectory in a
+  # future commit.
+  find "$unpacked_llvm_dir"/lib/clang/"$LLVM_VERSION"/include \
+       -type f \
+       -name '*.h' \
+       -exec cp '{}' include/ ';'
+
+  tar czf "$pants_output_archive_name" bin/ include/
+}
+
+
+## MacOS (LLVM-packaged release binaries)
+MACOS_REVS=(
+  10.7
+  10.8
+  10.9
+  10.10
+  10.11
+  10.12
+  10.13
+)
+LLVM_TMP_MACOS_PKG_DIR='llvm-macos-pkg'
+
+pushd "$LLVM_RELEASE_BUILD_DIRNAME"
+
+curl -L -O "https://releases.llvm.org/${LLVM_VERSION}/clang+llvm-${LLVM_VERSION}-x86_64-apple-darwin.tar.xz"
+tar xf "clang+llvm-${LLVM_VERSION}-x86_64-apple-darwin.tar.xz"
+llvm_macos_bin_release_dir_abs="$(pwd)/clang+llvm-${LLVM_VERSION}-final-x86_64-apple-darwin"
+
+mkdir -p "$LLVM_TMP_MACOS_PKG_DIR"
+pushd "$LLVM_TMP_MACOS_PKG_DIR"
+
+extract-required-files-from-unpacked-llvm \
+  "$llvm_macos_bin_release_dir_abs" \
+  "$LLVM_PANTS_ARCHIVE_NAME"
+
+llvm_macos_packaged_abs="$(pwd)/${LLVM_PANTS_ARCHIVE_NAME}"
+popd
+
+popd
+
+for rev in ${MACOS_REVS[@]}; do
+  dest_base="${CLANG_SUPPORTDIR}/mac/${rev}/${LLVM_VERSION}"
+  mkdir -p "$dest_base"
+  cp "$llvm_macos_packaged_abs" "${dest_base}/${LLVM_PANTS_ARCHIVE_NAME}"
+done
+
+
+## Linux (from source release)
+# We need cmake >= 3.4, so use the one we already build for pants.
+CMAKE_VERSION='3.9.5'
+CMAKE_BUILD_TMP_DIR='cmake-build-tmp'
+LLVM_BUILD_TMP_DIR='llvm-build'
+LLVM_TMP_LINUX_PKG_DIR='llvm-linux-pkg'
+
+"./build-cmake-${CMAKE_VERSION}.sh"
+cmake_linux_packaged_abs="$(pwd)/build-support/bin/cmake/linux/x86_64/${CMAKE_VERSION}/cmake.tar.gz"
+
+mkdir -p "$CMAKE_BUILD_TMP_DIR"
+pushd "$CMAKE_BUILD_TMP_DIR"
+tar zxf "$cmake_linux_packaged_abs"
+cmake_linux_bin_abs="$(pwd)/bin/cmake"
+popd
+
+pushd "$LLVM_RELEASE_BUILD_DIRNAME"
+
+# LLVM requires you to download the source for LLVM and the Clang frontend
+# separately. The alternative is checking out their SVN repo, which takes much
+# longer.
+curl -L -O "https://releases.llvm.org/${LLVM_VERSION}/llvm-${LLVM_VERSION}.src.tar.xz"
+curl -L -O "https://releases.llvm.org/${LLVM_VERSION}/cfe-${LLVM_VERSION}.src.tar.xz"
+tar xf "llvm-${LLVM_VERSION}.src.tar.xz"
+tar xf "cfe-${LLVM_VERSION}.src.tar.xz"
+
+mkdir -p "$LLVM_BUILD_TMP_DIR"
+pushd "$LLVM_BUILD_TMP_DIR"
+
+"$cmake_linux_bin_abs" \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DLLVM_EXTERNAL_CLANG_SOURCE_DIR="../cfe-${LLVM_VERSION}.src" \
+  -DLLVM_EXTERNAL_PROJECTS='clang' \
+  "../llvm-${LLVM_VERSION}.src"
+
+# NB: There appear to be race conditions when running make with any parallelism
+# here in a Docker image.
+make
+
+llvm_linux_source_release_dir_abs="$(pwd)"
+
+popd
+
+mkdir -p "$LLVM_TMP_LINUX_PKG_DIR"
+pushd "$LLVM_TMP_LINUX_PKG_DIR"
+
+extract-required-files-from-unpacked-llvm \
+  "$llvm_linux_source_release_dir_abs" \
+  "$LLVM_PANTS_ARCHIVE_NAME"
+
+llvm_linux_packaged_abs="$(pwd)/${LLVM_PANTS_ARCHIVE_NAME}"
+
+popd
+
+popd
+
+mkdir -p "${CLANG_SUPPORTDIR}/linux/x86_64/${LLVM_VERSION}"
+cp "$llvm_linux_packaged_abs" "${CLANG_SUPPORTDIR}/linux/x86_64/${LLVM_VERSION}/${LLVM_PANTS_ARCHIVE_NAME}"
diff --git a/build-cmake-3.9.5.sh b/build-cmake-3.9.5.sh
index 0b41a04..fdcc902 100755
--- a/build-cmake-3.9.5.sh
+++ b/build-cmake-3.9.5.sh
@@ -20,6 +20,6 @@ for rev in "10.8" "10.9" "10.10" "10.11" "10.12" "10.13"; do
   DEST_BASE="build-support/bin/cmake/mac/${rev}"
   mkdir -p "${DEST_BASE}"
   pushd "${DEST_BASE}" > /dev/null
-    ln -s "../10.7/3.9.5" "3.9.5"
+  ln -sf "../10.7/3.9.5" "3.9.5"
   popd > /dev/null
 done
diff --git a/build-support/bin/clang/linux/x86_64/5.0.1/clang.tar.gz b/build-support/bin/clang/linux/x86_64/5.0.1/clang.tar.gz
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diff --git a/build-support/bin/clang/mac/10.7/5.0.1/clang.tar.gz b/build-support/bin/clang/mac/10.7/5.0.1/clang.tar.gz
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diff --git a/build-support/bin/clang/mac/10.9/5.0.1/clang.tar.gz b/build-support/bin/clang/mac/10.9/5.0.1/clang.tar.gz
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