--- boost-1.61.0.ebuild	2016-05-18 13:30:30.000000000 +0100
+++ boost-1.61.0-r1.ebuild	2016-06-25 08:22:56.854855349 +0100
@@ -18,7 +18,7 @@ LICENSE="Boost-1.0"
 SLOT="0/${PV}" # ${PV} instead ${MAJOR_V} due to bug 486122
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~ppc-aix ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~sparc-solaris ~sparc64-solaris ~x86-solaris ~x86-winnt"
 
-IUSE="context debug doc icu +nls mpi python static-libs +threads tools"
+IUSE="c++11 context debug doc icu +nls mpi python static-libs +threads tools"
 
 RDEPEND="icu? ( >=dev-libs/icu-3.6:=[${MULTILIB_USEDEP}] )
 	!icu? ( virtual/libiconv[${MULTILIB_USEDEP}] )
@@ -163,8 +163,11 @@ src_configure() {
 		[[ $(gcc-version) > 4.3 ]] && append-flags -mno-altivec
 	fi
 
-	# Do _not_ use C++11 yet, make sure to force GNU C++ 98 standard.
-	append-cxxflags -std=gnu++98
+	# Allow user choice of C++ 11 or 98 standards.
+	# Modern compilers use C++ 11 by default and Boost
+	# compiled with 98 standards causes build failures
+	append-cxxflags -std=$(usex c++11 c++11 gnu++98 )
+	
 
 	use icu && OPTIONS+=" -sICU_PATH=${EPREFIX}/usr"
 	use icu || OPTIONS+=" --disable-icu boost.locale.icu=off"