--- a/binutils-config-4
+++ b/binutils-config-4
@@ -7,17 +7,23 @@
 #  config-TARGET:	CURRENT=version for TARGET
 #  TARGET-VER:		has a TARGET and VER variable
 
+: ${EPREFIX:="@GENTOO_PORTAGE_EPREFIX@"}
+[[ ${EPREFIX} = */ ]] && EPREFIX="${EPREFIX%/}"
+[[ -n ${EPREFIX} && ${EPREFIX} != /* ]] && EPREFIX="${PWD%/}/${EPREFIX}"
+
 : ${ROOT:=/}
 [[ ${ROOT} != */ ]] && ROOT="${ROOT}/"
 [[ ${ROOT} != /* ]] && ROOT="${PWD%/}/${ROOT}"
 
-cd /
+EROOT="${ROOT%/}${EPREFIX}/"
+
+cd "${EPREFIX}/"
 
 trap ":" INT QUIT TSTP
 
 argv0=${0##*/}
-source /etc/init.d/functions.sh || {
-	echo "${argv0}: Could not source /etc/init.d/functions.sh!" 1>&2
+source "@GENTOO_PORTAGE_EPREFIX@"/etc/init.d/functions.sh || {
+	echo "${argv0}: Could not source @GENTOO_PORTAGE_EPREFIX@/etc/init.d/functions.sh!" 1>&2
 	exit 1
 }
 esyslog() { :; }
@@ -96,14 +102,14 @@ setup_env() {
 		# Newer paths: /usr/${HOST}/${TARGET}/...
 		# Older paths: /usr/${TARGET}/...
 		#
-		if [[ -d ${ROOT}/usr/${HOST}/${TARGET}/binutils-bin/${VER} ]] ; then
-			BINPATH=/usr/${HOST}/${TARGET}/binutils-bin/${VER}
-			BINPATH_LINKS=/usr/libexec/gcc/${TARGET}
+		if [[ -d ${ROOT}${EPREFIX}/usr/${HOST}/${TARGET}/binutils-bin/${VER} ]] ; then
+			BINPATH="${EPREFIX}"/usr/${HOST}/${TARGET}/binutils-bin/${VER}
+			BINPATH_LINKS="${EPREFIX}"/usr/libexec/gcc/${TARGET}
 		fi
 	fi
 	if [[ -z ${BINPATH} ]] ; then
-		BINPATH=/usr/${TARGET}/binutils-bin/${VER}
-		BINPATH_LINKS=/usr/${TARGET}/bin
+		BINPATH="${EPREFIX}"/usr/${TARGET}/binutils-bin/${VER}
+		BINPATH_LINKS="${EPREFIX}"/usr/${TARGET}/bin
 	fi
 }
 
@@ -113,24 +119,24 @@ switch_profile() {
 	setup_env || return 1
 
 	cd "${ROOT}/${BINPATH}" || exit 1
-	mkdir -p "${ROOT}/${BINPATH_LINKS}" "${ROOT}/usr/bin"
+	mkdir -p "${ROOT}/${BINPATH_LINKS}" "${EROOT}/usr/bin"
 	for x in * ; do
 		atomic_ln "${BINPATH}/${x}" "${ROOT}/${BINPATH_LINKS}" "${x}"
-		atomic_ln "${BINPATH_LINKS}/${x}" "${ROOT}/usr/bin" "${TARGET}-${x}"
+		atomic_ln "${BINPATH_LINKS}/${x}" "${EROOT}/usr/bin" "${TARGET}-${x}"
 		if [[ ${TARGET} == ${HOST} ]] ; then
-			atomic_ln "${TARGET}-${x}" "${ROOT}/usr/bin" "${x}"
+			atomic_ln "${TARGET}-${x}" "${EROOT}/usr/bin" "${x}"
 		fi
 	done
 
 	#
 	# Generate library / ldscripts symlinks
 	#
-	: ${LIBPATH:=/usr/lib/binutils/${TARGET}/${VER}}
+	: ${LIBPATH:=${EPREFIX}/usr/lib/binutils/${TARGET}/${VER}}
 	cd "${ROOT}/${LIBPATH}" || exit 1
 	if [[ ${TARGET} == ${HOST} ]] ; then
-		dstlib=${ROOT}/usr/${HOST}/lib
+		dstlib=${EROOT}/usr/${HOST}/lib
 	else
-		dstlib=${ROOT}/usr/${HOST}/${TARGET}/lib
+		dstlib=${EROOT}/usr/${HOST}/${TARGET}/lib
 	fi
 	# When upgrading, we need to clean up ldscripts and libs
 	mkdir -p "${dstlib}"
@@ -148,16 +154,16 @@ switch_profile() {
 	if [[ -d ${ROOT}/${INCPATH} ]] ; then
 		cd "${ROOT}/${INCPATH}" || exit 1
 		if [[ ${HOST} == ${TARGET} ]] ; then
-			mkdir -p "${ROOT}/usr/include"
+			mkdir -p "${EROOT}/usr/include"
 			for x in * ; do
-				atomic_ln "${INCPATH}/${x}" "${ROOT}/usr/include" "${x}"
+				atomic_ln "${INCPATH}/${x}" "${EROOT}/usr/include" "${x}"
 			done
 		else
 			# Clean out old path -- cannot use '-exec {} +' syntax here
-			find . -type f -exec rm -f "${ROOT}/usr/${TARGET}/usr/include/{}" \;
-			rmdir "${ROOT}/usr/${TARGET}/usr/include" >& /dev/null
-			rmdir "${ROOT}/usr/${TARGET}/usr" >& /dev/null
-			rmdir "${ROOT}/usr/${TARGET}" >& /dev/null
+			find . -type f -exec rm -f "${EROOT}/usr/${TARGET}/usr/include/{}" \;
+			rmdir "${EROOT}/usr/${TARGET}/usr/include" >& /dev/null
+			rmdir "${EROOT}/usr/${TARGET}/usr" >& /dev/null
+			rmdir "${EROOT}/usr/${TARGET}" >& /dev/null
 		fi
 	fi
 
@@ -165,20 +171,20 @@ switch_profile() {
 	# Make sure proper paths get updated
 	#
 	if [[ ${TARGET} == ${HOST} ]] ; then
-		DATAPATH=/usr/share/binutils-data/${TARGET}/${VER}
-		local e="${ROOT}"/etc/env.d/05binutils
+		DATAPATH="${EPREFIX}"/usr/share/binutils-data/${TARGET}/${VER}
+		local e="${EROOT}"/etc/env.d/05binutils
 		local ee="${e}.tmp"
 		rm -f "${ee}"
 		[[ -d ${DATAPATH}/man  ]] && echo "MANPATH=${DATAPATH}/man"   >> "${ee}"
 		[[ -d ${DATAPATH}/info ]] && echo "INFOPATH=${DATAPATH}/info" >> "${ee}"
 		# hmm, `ld` has this in SEARCH_DIR(), but ld.so does not ...
-		if [[ -d ${ROOT}/etc/ld.so.conf.d ]] ; then
-			local l="${ROOT}"/etc/ld.so.conf.d/05binutils.conf
+		if [[ -d ${EROOT}/etc/ld.so.conf.d ]] ; then
+			local l="${EROOT}"/etc/ld.so.conf.d/05binutils.conf
 			local ll="${l}.tmp"
-			echo "/usr/${TARGET}/lib" > "${ll}"
+			echo "${EPREFIX}/usr/${TARGET}/lib" > "${ll}"
 			mv_if_diff "${ll}" "${l}"
 		else
-			echo "LDPATH=/usr/${TARGET}/lib" >> "${ee}"
+			echo "LDPATH=${EPREFIX}/usr/${TARGET}/lib" >> "${ee}"
 		fi
 		mv_if_diff "${ee}" "${e}"
 	fi
@@ -198,7 +204,7 @@ switch_profile() {
 		echo
 		ewarn "Please remember to run:"
 		echo
-		ewarn "  # . /etc/profile"
+		ewarn "  # . ${EPREFIX}/etc/profile"
 		echo
 	fi
 
@@ -223,7 +229,7 @@ uninstall_target() {
 		die "no profiles exist for '${TARGET}'"
 	fi
 
-	rm -f "${ENV_D}"/config-${TARGET} "${ROOT}"/etc/ld.so.conf.d/05binutils.conf
+	rm -f "${ENV_D}"/config-${TARGET} "${EROOT}"/etc/ld.so.conf.d/05binutils.conf
 
 	local x
 	for x in \
@@ -232,28 +238,28 @@ uninstall_target() {
 		nm objcopy objdump ranlib readelf size strings strip
 	do
 		x=(
-			"${ROOT}"/usr/bin/${TARGET}-${x}
-			"${ROOT}"/usr/{${HOST}/,}${TARGET}/bin/${x}
-			"${ROOT}"/usr/libexec/gcc/${TARGET}/${x}
+			"${EROOT}"/usr/bin/${TARGET}-${x}
+			"${EROOT}"/usr/{${HOST}/,}${TARGET}/bin/${x}
+			"${EROOT}"/usr/libexec/gcc/${TARGET}/${x}
 		)
 		rm -f "${x[@]}"
 	done
 	for x in ansidecl.h bfd.h bfdlink.h dis-asm.h symcat.h ; do
-		rm -f "${ROOT}"/usr/{${HOST}/,}${TARGET}/{usr/,}include/${x}
+		rm -f "${EROOT}"/usr/{${HOST}/,}${TARGET}/{usr/,}include/${x}
 	done
 	for x in bfd iberty opcodes ; do
-		rm -f "${ROOT}"/usr/${HOST}/${TARGET}/lib/lib${x}{{-*,}.so,.a,.la}
+		rm -f "${EROOT}"/usr/${HOST}/${TARGET}/lib/lib${x}{{-*,}.so,.a,.la}
 	done
 	# Delete broken symlinks
-	local destdir="${ROOT}/usr/${HOST}/${TARGET}"
+	local destdir="${EROOT}/usr/${HOST}/${TARGET}"
 	rm -f "${destdir}"/lib/ldscripts
 	find -L "${destdir}"/lib -type l -exec rm {} +
 	rmdir \
 		"${destdir}"/{bin,include,lib,usr} \
 		"${destdir}" \
-		"${ROOT}"/var/db/pkg/cross-${TARGET} \
-		"${ROOT}"/usr/{${HOST}/,}${TARGET}/bin \
-		"${ROOT}"/usr/libexec/gcc/${TARGET} \
+		"${EROOT}"/var/db/pkg/cross-${TARGET} \
+		"${EROOT}"/usr/{${HOST}/,}${TARGET}/bin \
+		"${EROOT}"/usr/libexec/gcc/${TARGET} \
 		2>/dev/null
 
 	rm -f "${ENV_D}"/${TARGET}-*
@@ -352,7 +358,7 @@ set_HOST() {
 	: ${HOST:=${CHOST:-$(portageq envvar CHOST)}}
 }
 
-ENV_D="${ROOT}etc/env.d/binutils"
+ENV_D="${EROOT}etc/env.d/binutils"
 
 DEBUG="no"
 NEED_ACTION="yes"