diff --git a/toolchains.sh b/toolchains.sh
index 6b73103..4472a3f 100755
--- a/toolchains.sh
+++ b/toolchains.sh
@@ -25,7 +25,9 @@
 #
 
 
-PIURL=https://github.com/tttapa/docker-arm-cross-toolchain/releases/latest/download/x-tools-
+G_SCRIPT=$0
+G_BUILDROOT=${PWD}
+G_PIURL=https://github.com/tttapa/docker-arm-cross-toolchain/releases/latest/download/x-tools-
 
 
 function buildMacOSXToolchain() {
@@ -141,35 +143,47 @@ function install_x86_64_windows() {
 }
 
 
+function install_x86_windows() {
+	# x86 Windows.
+	install_x86_64_windows
+}
+
+
 function install_aarch64_pi() {
 	# Raspberry Pi, aarch64.
-	wget -O- ${PIURL}aarch64-rpi3-linux-gnu.tar.xz | tar xJ
+	wget -O- ${G_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
+	wget -O- ${G_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
+	wget -O- ${G_PIURL}armv8-rpi3-linux-gnueabihf.tar.xz | tar xJ
 	#***TODO*** sysroot
 }
 
 
 
 function install_x86_64_macos() {
-	# MacOS x86, x86_64.
+	# MacOS x86_64.
 	#***TODO***  https://stackoverflow.com/questions/67712376/after-updating-gcc-clang-cant-find-libstdc-anymore
 	buildMacOSXToolchain MacOSX10.13.sdk.tar.xz Xcode_9.4.1.xip x86_64-macos-apple
 }
 
 
+function install_x86_macos() {
+	# MacOS x86.
+	install_x86_64_macos
+}
+
+
 function install_aarch64_macos() {
 	# MacOS aarch64.
 	#***TODO***  https://stackoverflow.com/questions/67712376/after-updating-gcc-clang-cant-find-libstdc-anymore
@@ -195,6 +209,95 @@ function install_x86_dos() {
 }
 
 
+function use_toolchain() {
+	local ARCH=$1
+	local PLAT=$2
+
+	case "${PLAT}" in
+
+		linux)
+			case "${ARCH}" in
+				x86)
+					TRIPLE="i686-linux-gnu"
+					;;
+				x86_64)
+					TRIPLE="x86_64-linux-gnu"
+					;;
+			esac
+			CROSS_OS="linux"
+			CC="${TRIPLE}-gcc"
+			CXX="${TRIPLE}-g++"
+			RANLIB="${TRIPLE}-ranlib"
+			;;
+
+		macos)
+			case "${ARCH}" in
+				aarch64)
+					TRIPLE="aarch64-apple-darwin22.4"
+					OSXCROSS_LOCATION=${G_BUILDROOT}/x-tools/aarch64-macos-apple
+					;;
+				x86)
+					TRIPLE="i386-apple-darwin17"
+					OSXCROSS_LOCATION=${G_BUILDROOT}/x-tools/x86_64-macos-apple
+					;;
+				x86_64)
+					TRIPLE="x86_64-apple-darwin17"
+					OSXCROSS_LOCATION=${G_BUILDROOT}/x-tools/x86_64-macos-apple
+					;;
+			esac
+			CROSS_OS="darwin"
+			CC="${OSXCROSS_LOCATION}/bin/${TRIPLE}-clang"
+			CXX="${OSXCROSS_LOCATION}/bin/${TRIPLE}-clang++"
+			RANLIB="${OSXCROSS_LOCATION}/bin/${TRIPLE}-ranlib"
+			"${OSXCROSS_LOCATION}/bin/osxcross-conf" 2>/dev/null
+			echo "export OSXCROSS_LOCATION=\"${OSXCROSS_LOCATION}\""
+			echo "export LDFLAGS=\"-fuse-ld=${OSXCROSS_LOCATION}/bin/${TRIPLE}-ld\""
+			echo "export PATH=\"${OSXCROSS_LOCATION}/bin:${PATH}\""
+			echo "export OSXCROSS_PKG_CONFIG_USE_NATIVE_VARIABLES=1"
+			;;
+
+		pi)
+			case "${ARCH}" in
+				aarch64)
+					TRIPLE="aarch64-rpi3-linux-gnu"
+					;;
+				armv6)
+					TRIPLE="armv6-rpi-linux-gnueabihf"
+					;;
+				armv8)
+					TRIPLE="armv8-rpi3-linux-gnueabihf"
+					;;
+			esac
+			;;
+
+		windows)
+			case "${ARCH}" in
+				x86)
+					TRIPLE="i686-w64-mingw32"
+					;;
+				x86_64)
+					TRIPLE="x86_64-w64-mingw32"
+					;;
+			esac
+			CC="${TRIPLE}-gcc-posix"
+			CXX="${TRIPLE}-g++-posix"
+			RANLIB="${TRIPLE}-ranlib"
+			SUFFIX=".exe"
+			CROSS_OS="mingw32"
+			;;
+
+	esac
+
+	echo "export TOOLCHAIN_FILE=\"${G_BUILDROOT}/cmake/${TRIPLE}.cmake\""
+	echo "export CC=\"${CC}\""
+	echo "export CXX=\"${CXX}\""
+	echo "export RANLIB=\"${RANLIB}\""
+	echo "export SUFFIX=\"${SUFFIX}\""
+	echo "export CROSS_OS=\"${CROSS_OS}\""
+	echo "export TRIPLE=\"${TRIPLE}\""
+}
+
+
 MODE=$1
 ARCH=$2
 PLAT=$3
@@ -202,18 +305,20 @@ PLAT=$3
 HELP=1
 
 COLS=2
-ROWS=9
+ROWS=11
 row=0
 declare -A PLATFORMS=()
 PLATFORMS[0]="x86_64";   PLATFORMS[1]="linux"
 PLATFORMS[2]="x86";      PLATFORMS[3]="linux"
 PLATFORMS[4]="x86_64";   PLATFORMS[5]="windows"
-PLATFORMS[6]="aarch64";  PLATFORMS[7]="pi"
-PLATFORMS[8]="armv6";    PLATFORMS[9]="pi"
-PLATFORMS[10]="armv8";   PLATFORMS[11]="pi"
-PLATFORMS[12]="x86_64";  PLATFORMS[13]="macos"
-PLATFORMS[14]="aarch64"; PLATFORMS[15]="macos"
-PLATFORMS[16]="x86";     PLATFORMS[17]="dos"
+PLATFORMS[6]="x86";      PLATFORMS[7]="windows"
+PLATFORMS[8]="aarch64";  PLATFORMS[9]="pi"
+PLATFORMS[10]="armv6";   PLATFORMS[11]="pi"
+PLATFORMS[12]="armv8";   PLATFORMS[13]="pi"
+PLATFORMS[14]="x86_64";  PLATFORMS[15]="macos"
+PLATFORMS[16]="x86";     PLATFORMS[17]="macos"
+PLATFORMS[18]="aarch64"; PLATFORMS[19]="macos"
+PLATFORMS[20]="x86";     PLATFORMS[21]="dos"
 
 if [[ "${MODE}" == "install" ]]; then
 	# Install all toolchains.
@@ -255,9 +360,7 @@ if [[ "${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
-			#use_${ARCH}_${PLAT}
-			set +x
+			use_toolchain ${ARCH} ${PLAT}
 		fi
 	done
 fi
@@ -269,7 +372,7 @@ if [[ ${HELP} -eq 1 ]]; then
 		Kangaroo Punch Toolchain Installer
 		http://skunkworks.kangaroopunch.com
 
-		Usage:  $0 install [architecture] [platform]
+		Usage:  ${G_SCRIPT} [install|use] [architecture] [platform]
 
 		Where [architecture] and [platform] are one of:
 
@@ -279,16 +382,24 @@ if [[ ${HELP} -eq 1 ]]; then
 	done
 	cat <<-HELP
 
-		If [architecture] and [platform] are both "all",
-		everything will be installed.
+		For "install" mode:
 
-		if [architecture] is "all", then all available
-		architectures for the specified [platform] will
-		be installed.
+		    If [architecture] and [platform] are both "all",
+		    everything will be installed.
 
-		NOTE:  You should always install x86_64 linux
-		       before attempting to install other
-		       toolchains.
+		    if [architecture] is "all", then all available
+		    architectures for the specified [platform] will
+		    be installed.
+
+		    NOTE:  You should always install x86_64 linux
+		           before attempting to install other
+		           toolchains.
+
+		For "use" mode:
+
+		    Souce the output of this script to set the environment
+		    to use the appropriate toolchain for [architecture] and
+		    [platform].
 
 	HELP
 fi