--- clang.orig/clang-10.0.0.ebuild	2020-10-30 06:07:22.000000000 +0300
+++ clang/clang-10.0.0.ebuild	2020-10-30 06:29:56.000000000 +0300
@@ -34,7 +34,7 @@
 
 LICENSE="Apache-2.0-with-LLVM-exceptions UoI-NCSA MIT"
 SLOT="$(ver_cut 1)"
-KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~x86 ~amd64-linux"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~x86 ~amd64-linux ~x64-macos"
 IUSE="debug default-compiler-rt default-libcxx doc +static-analyzer
 	test xml kernel_FreeBSD ${ALL_LLVM_TARGETS[*]}"
 REQUIRED_USE="${PYTHON_REQUIRED_USE}
@@ -234,6 +234,7 @@
 		)
 	fi
 
+	use x64-macos && local -x CXXFLAGS="${CXXFLAGS} -std=c++14"
 	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
 	use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
 	cmake-utils_src_configure