--- /usr/portage/net-libs/libupnp/libupnp-1.6.18.ebuild	2013-04-05 02:19:49.000000000 +0400
+++ libupnp-1.6.18.ebuild	2014-10-28 15:14:29.931358217 +0300
@@ -18,6 +18,9 @@
 DOCS="NEWS README ChangeLog"
 
 src_prepare() {
+	if [[ $(/usr/bin/ldd --version | head -n1 | grep -o ") [0-9]\.[0-9]\+" | cut -d. -f2) -ge 20 ]]; then
+		epatch "${FILESDIR}/upnpstring-glibc-2.20-fix.patch"
+	fi
 	sed -e '/AX_CFLAGS_GCC_OPTION/s:-Os::g' \
 		-i "${S}/configure.ac" || die