--- a/dev-qt/qtcore/qtcore-5.11.2-r1.ebuild	2018-10-26 14:43:33.042554332 +0200
+++ b/dev-qt/qtcore/qtcore-5.11.2-r1.ebuild	2018-10-31 19:38:25.150730332 +0100
@@ -36,6 +36,8 @@
 	doc
 )
 
+QT5_COMPILE_FOR_HOST_SUBDIR=src/tools/qfloat16-tables
+
 QT5_GENTOO_PRIVATE_CONFIG=(
 	!:network
 	!:sql
@@ -47,6 +49,11 @@
 	"${FILESDIR}/${P}-export-qt_open64.patch" # bug 669010
 )
 
+src_prepare() {
+	tc-is-cross-compiler && PATCHES+=("${FILESDIR}/${P}-cross-qfloat16-tables.patch")
+	qt5-build_src_prepare
+}
+
 src_configure() {
 	local myconf=(
 		$(qt_use icu)