--- /var/gentoo/portage/dev-util/mingw64-runtime/mingw64-runtime-3.0.0.ebuild	2013-10-13 22:31:16.000000000 +0300
+++ /var/gentoo/portage/dev-util/mingw64-runtime/mingw64-runtime-3.0.0.ebuild	2013-10-16 00:32:35.909837217 +0300
@@ -39,6 +39,15 @@ pkg_setup() {
 	fi
 }
 
+src_prepare() {
+	if ! just_headers; then
+		cp -a "${S}" "${S}.headers"
+		cd "${S}.headers/mingw-w64-headers"
+		CHOST=${CTARGET} econf --enable-sdk
+		emake install DESTDIR="${T}/headers"
+	fi
+}
+
 src_configure() {
 	local extra_conf=()
 
@@ -61,6 +70,8 @@ src_configure() {
 		--with-headers \
 		--enable-sdk \
 		$(use_enable idl) \
+		CPPFLAGS="-I${T}/headers/usr/include" \
+		--with-sysroot="${T}/headers/usr/include" \
 		"${extra_conf[@]}"
 }