--- /dev/null
+https://bugs.gentoo.org/548310
+
+apply boost.m4 updates to fix building w/gcc-5
+
+--- a/configure
++++ b/configure
+@@ -17481,8 +17481,10 @@
+ boost-lib-version = BOOST_LIB_VERSION
+ _ACEOF
+ if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
++ grep -v '#' |
+ tr -d '\r' |
+- $SED -n -e "/^boost-lib-version = /{s///;s/\"//g;p;q;}" >conftest.i 2>&1; then :
++ tr -s '\n' ' ' |
++ $SED -n -e "/^boost-lib-version = /{s///;s/[\" ]//g;p;q;}" >conftest.i 2>&1; then :
+ boost_cv_lib_version=`cat conftest.i`
+ fi
+ rm -rf conftest*