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-rw-r--r--nixpkgs/pkgs/development/compilers/llvm/9/clang/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/compilers/llvm/9/clang/default.nix b/nixpkgs/pkgs/development/compilers/llvm/9/clang/default.nix
index c938a01f8979..9bc7a88e9123 100644
--- a/nixpkgs/pkgs/development/compilers/llvm/9/clang/default.nix
+++ b/nixpkgs/pkgs/development/compilers/llvm/9/clang/default.nix
@@ -28,6 +28,7 @@ let
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++11"
       "-DCLANGD_BUILD_XPC=OFF"
+      "-DLLVM_ENABLE_RTTI=ON"
     ] ++ stdenv.lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"