diff --git a/.gitignore b/.gitignore
index 425e0ff..33355ca 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *~
+clang/
 work/
 x-tools/
 *.xip
diff --git a/cmake/x86_64-linux-gnu.cmake b/cmake/x86_64-linux-gnu.cmake
index 315382f..423e8d2 100644
--- a/cmake/x86_64-linux-gnu.cmake
+++ b/cmake/x86_64-linux-gnu.cmake
@@ -25,5 +25,10 @@
 set(CMAKE_SYSTEM_NAME Linux)
 set(CMAKE_SYSTEM_PROCESSOR x86_64)
 
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+
 set(KANGAROO_OS linux)
 set(KANGAROO_ARCH x86_64)
diff --git a/install.sh b/toolchains.sh
similarity index 63%
rename from install.sh
rename to toolchains.sh
index a55c19a..6b73103 100755
--- a/install.sh
+++ b/toolchains.sh
@@ -33,9 +33,9 @@ function buildMacOSXToolchain() {
 	local XCODE=$2
 	local PLATFORM=$3
 	local BASE=$(pwd)
-	# This isn't great.  What if there is more than one version installed?
-	#local LLVM=$(ls -1 /usr/lib | grep llvm)
-	#local CLANG=$(ls -1 /usr/lib/${LLVM}/lib/clang | grep -F .)
+	local CLANG=
+	local RTPATH=
+	local CROSSTOOLS="${BASE}/x-tools/${PLATFORM}"
 
 	mkdir -p work
 
@@ -47,9 +47,17 @@ function buildMacOSXToolchain() {
 	if [[ ! -f x-tools/${PLATFORM}/toolchain.cmake ]]; then
 		pushd work/osxcross
 			# Have we built Apple's clang?
-			#if [[ ! -d "${BASE}/clang" ]]; then
-			#	UNATTENDED=1 INSTALLPREFIX=${BASE}/clang ./build_apple_clang.sh
-			#fi
+			if [[ ! -d "${BASE}/clang" ]]; then
+				UNATTENDED=1 INSTALLPREFIX=${BASE}/clang ./build_apple_clang.sh
+				pushd build/clang*/build_stage2
+					make install
+				popd
+			fi
+			# Use our fresh new clang.
+			source <("${CROSSTOOLS}/bin/osxcross-conf" 2>/dev/null)
+			export PATH="${BASE}/clang/bin:${CROSSTOOLS}/bin:${PATH}"
+			export CC="${BASE}/clang/bin/clang"
+			export CXX="${BASE}/clang/bin/clang++"
 			# Do we have an existing SDK tarball?
 			if [[ ! -f "${BASE}/${SDK}" ]]; then
 				# Nope.  Build tarball and keep for later.
@@ -59,12 +67,35 @@ function buildMacOSXToolchain() {
 			# Put tarball in place.
 			cp -f "${BASE}/${SDK}" tarballs/.
 			# Build SDK.
-			UNATTENDED=1 TARGET_DIR=${BASE}/x-tools/${PLATFORM} ./build.sh
+			UNATTENDED=1 TARGET_DIR="${CROSSTOOLS}" ./build.sh
 			# Fix fubar in osxcross.
 			[[ -d target ]] && rm -rf target
-			ln -sf ${BASE}/x-tools/${PLATFORM} target
+			ln -sf "${CROSSTOOLS}" target
+:<<NO_GCC
+			# Build GCC
+			# Fix another fubar in osxcross.
+			if [[ ! -f build_gcc-fixed.sh ]]; then
+				sed '/^pushd gcc.*/a \.\/contrib\/download_prerequisites' build_gcc.sh > build_gcc-fixed.sh
+				chmod +x build_gcc-fixed.sh
+			fi
+			TARGET_DIR="${CROSSTOOLS}" ./build_gcc-fixed.sh
+NO_GCC
 			# Build compiler runtime.
-			./build_compiler_rt.sh
+			#***TODO*** This fails to find <optional> for x86.
+			RTPATH="${BASE}/clang/lib/clang"
+			CLANG=$(ls -1 "${RTPATH}" | grep -F . | sort | tail -n1)
+			if [[ "${CLANG}" == "" ]]; then
+				CLANG=$(ls -1 "${RTPATH}" | sort | tail -n1)
+			fi
+			RTPATH="${RTPATH}/${CLANG}/lib/darwin"
+			if [[ -d "${RTPATH}" ]]; then
+				rm -rf "${RTPATH}"
+			fi
+			CXX_FLAGS="-std=c++17" ENABLE_COMPILER_RT_INSTALL=1 ./build_compiler_rt.sh
+			if [[ -d "${RTPATH}" ]]; then
+				mv -f "${RTPATH}" "${CROSSTOOLS}/."
+				echo "RTPATH=\"${RTPATH}\"" > ${CROSSTOOLS}/rtpath.inc
+			fi
 			# Tidy up for next build.
 			./cleanup.sh
 		popd
@@ -75,16 +106,20 @@ function buildMacOSXToolchain() {
 function install_x86_64_linux() {
 	# Required tools for Linux x86_64.  These should always be installed.
 	sudo apt-get install -y \
+		autoconf \
 		binutils \
 		bison \
 		build-essential \
 		clang \
 		cmake \
+		cmake-curses-gui \
 		curl \
 		flex \
 		git \
 		git-lfs \
 		liblzma-dev \
+		libtool \
+		nasm \
 		texinfo \
 		unzip \
 		zlib1g-dev
@@ -93,7 +128,10 @@ function install_x86_64_linux() {
 
 function install_x86_linux() {
 	# x86 Linux support.
-	sudo apt-get install -y gcc-multilib
+	sudo dpkg --add-architecture i386
+	sudo apt-get install -y \
+		gcc-i686-linux-gnu \
+		g++-i686-linux-gnu
 }
 
 
@@ -104,19 +142,23 @@ function install_x86_64_windows() {
 
 
 function install_aarch64_pi() {
-	# Raspberry Pi, various CPUs.
+	# Raspberry Pi, aarch64.
 	wget -O- ${PIURL}aarch64-rpi3-linux-gnu.tar.xz | tar xJ
+	#***TODO*** sysroot
 }
 
 
 function install_armv6_pi() {
+	# Raspberry Pi, armv6.
 	wget -O- ${PIURL}armv6-rpi-linux-gnueabihf.tar.xz | tar xJ
+	#***TODO*** sysroot
 }
 
 
 function install_armv8_pi() {
+	# Raspberry Pi, armv8.
 	wget -O- ${PIURL}armv8-rpi3-linux-gnueabihf.tar.xz | tar xJ
-	#***TODO*** sysroots
+	#***TODO*** sysroot
 }
 
 
@@ -130,6 +172,7 @@ function install_x86_64_macos() {
 
 function install_aarch64_macos() {
 	# MacOS aarch64.
+	#***TODO***  https://stackoverflow.com/questions/67712376/after-updating-gcc-clang-cant-find-libstdc-anymore
 	buildMacOSXToolchain MacOSX13.3.sdk.tar.xz Xcode_14.3.1.xip aarch64-macos-apple
 }
 
@@ -152,8 +195,9 @@ function install_x86_dos() {
 }
 
 
-ARCH=$1
-PLAT=$2
+MODE=$1
+ARCH=$2
+PLAT=$3
 
 HELP=1
 
@@ -171,35 +215,48 @@ PLATFORMS[12]="x86_64";  PLATFORMS[13]="macos"
 PLATFORMS[14]="aarch64"; PLATFORMS[15]="macos"
 PLATFORMS[16]="x86";     PLATFORMS[17]="dos"
 
-# Install all toolchains.
-if [[ "${ARCH}" == "all" && "${PLAT}" == "all" ]]; then
-	HELP=0
-	for (( row=0; row<ROWS; row++ )); do
-		set -x
-		install_${PLATFORMS[$((${COLS}*${row}))]}_${PLATFORMS[$((${COLS}*${row}+1))]}
-		set +x
-	done
-fi
-
-# Install all toolchains for a specific platform.
-if [[ "${ARCH}" == "all" && "${PLAT}" != "all" ]]; then
-	HELP=0
-	for (( row=0; row<ROWS; row++ )); do
-		if [[ "${PLAT}" == "${PLATFORMS[$((${COLS}*${row}+1))]}" ]]; then
+if [[ "${MODE}" == "install" ]]; then
+	# Install all toolchains.
+	if [[ "${ARCH}" == "all" && "${PLAT}" == "all" ]]; then
+		HELP=0
+		for (( row=0; row<ROWS; row++ )); do
 			set -x
-			install_${PLATFORMS[$((${COLS}*${row}))]}_${PLAT}
+			install_${PLATFORMS[$((${COLS}*${row}))]}_${PLATFORMS[$((${COLS}*${row}+1))]}
 			set +x
-		fi
-	done
+		done
+	fi
+
+	# Install all toolchains for a specific platform.
+	if [[ "${ARCH}" == "all" && "${PLAT}" != "all" ]]; then
+		HELP=0
+		for (( row=0; row<ROWS; row++ )); do
+			if [[ "${PLAT}" == "${PLATFORMS[$((${COLS}*${row}+1))]}" ]]; then
+				set -x
+				install_${PLATFORMS[$((${COLS}*${row}))]}_${PLAT}
+				set +x
+			fi
+		done
+	fi
+
+	# Install a single toolchain.
+	if [[ "${ARCH}" != "all" && "${PLAT}" != "all" ]]; then
+		for (( row=0; row<ROWS; row++ )); do
+			if [[ "${ARCH}" == "${PLATFORMS[$((${COLS}*${row}))]}" && "${PLAT}" == "${PLATFORMS[$((${COLS}*${row}+1))]}" ]]; then
+				HELP=0
+				set -x
+				install_${ARCH}_${PLAT}
+				set +x
+			fi
+		done
+	fi
 fi
 
-# Install a single toolchain.
-if [[ "${ARCH}" != "all" && "${PLAT}" != "all" ]]; then
+if [[ "${MODE}" == "use" ]]; then
 	for (( row=0; row<ROWS; row++ )); do
 		if [[ "${ARCH}" == "${PLATFORMS[$((${COLS}*${row}))]}" && "${PLAT}" == "${PLATFORMS[$((${COLS}*${row}+1))]}" ]]; then
 			HELP=0
 			set -x
-			install_${ARCH}_${PLAT}
+			#use_${ARCH}_${PLAT}
 			set +x
 		fi
 	done
@@ -212,7 +269,7 @@ if [[ ${HELP} -eq 1 ]]; then
 		Kangaroo Punch Toolchain Installer
 		http://skunkworks.kangaroopunch.com
 
-		Usage:  $0 [architecture] [platform]
+		Usage:  $0 install [architecture] [platform]
 
 		Where [architecture] and [platform] are one of: