--- libcxxabi-11.0.0.mainline.ebuild	2020-11-30 16:18:52.000000000 -0600
+++ libcxxabi-11.0.0.mainline.ebuild	2020-12-01 23:17:55.000000000 -0600
@@ -5,6 +5,7 @@ 
 
 CMAKE_ECLASS=cmake
 PYTHON_COMPAT=( python3_{6..9} )
+# prefix change might need flag-o-matic
 inherit cmake-multilib llvm llvm.org python-any-r1 toolchain-funcs
 
 DESCRIPTION="Low level support for a standard C++ library"
@@ -16,7 +17,7 @@ 
 
 LICENSE="Apache-2.0-with-LLVM-exceptions || ( UoI-NCSA MIT )"
 SLOT="0"
-KEYWORDS="amd64 arm arm64 x86"
+KEYWORDS="amd64 arm arm64 x86 ~x64-macos"
 IUSE="+libunwind +static-libs test elibc_musl"
 RESTRICT="!test? ( test )"
 
@@ -77,6 +78,20 @@ 
 			-DLLVM_LIT_ARGS="$(get_lit_flags);--param=cxx_under_test=${clang_path}"
 		)
 	fi
+
+	# prefix change needed?
+	# make sure we build multilib on OSX, because llvm insists on
+	# building multilib too
+	#if [[ ${CHOST} == *86*-darwin* ]] ; then
+	#	append-flags -arch i386 -arch x86_64
+	#	append-cxxflags -std=c++11
+	#	local mycmakeargs+=(
+	#		# disable test for libstdc++ leaking in from LLVM cmake module -
+	#		# apart from libcxx headers, libcxxabi is self-contained
+	#		-DLLVM_ENABLE_LIBCXX=ON
+	#	)
+	#fi
+
 	cmake_src_configure
 }