--- a/usr/lib64/portage/python3.4/phase-helpers.sh
+++ b/usr/lib64/portage/python3.4/phase-helpers.sh
@@ -590,7 +590,7 @@ econf() {
 		fi
 
 		local conf_args=()
-		if ___eapi_econf_passes_--disable-dependency-tracking || ___eapi_econf_passes_--disable-silent-rules || ___eapi_econf_passes_--docdir_and_--htmldir; then
+		if ___eapi_econf_passes_--disable-dependency-tracking || ___eapi_econf_passes_--disable-silent-rules || ___eapi_econf_passes_--docdir_and_--htmldir || [ -n "$SYSROOT" ] ; then
 			local conf_help=$("${ECONF_SOURCE}/configure" --help 2>/dev/null)
 
 			if ___eapi_econf_passes_--disable-dependency-tracking; then
@@ -614,6 +614,11 @@ econf() {
 					conf_args+=( --htmldir="${EPREFIX}"/usr/share/doc/${PF}/html )
 				fi
 			fi
+			if [ -n "$SYSROOT" ] ; then
+			    if [[ ${conf_help} == *--with-sysroot* ]]; then
+				conf_args+=( --with-sysroot="${SYSROOT}" )
+			    fi
+			fi
 		fi
 
 		# if the profile defines a location to install libs to aside from default, pass it on.