diff --git a/programming/misc/libcxx/actions.py b/programming/misc/libcxx/actions.py
index a4f49ca205..99694ec024 100755
--- a/programming/misc/libcxx/actions.py
+++ b/programming/misc/libcxx/actions.py
@@ -77,6 +77,8 @@ def setup():
                           -DLIBUNWIND_INSTALL_LIBRARY=OFF \
                           -DLIBUNWIND_ENABLE_SHARED=ON \
                           -DLIBUNWIND_USE_COMPILER_RT=ON \
+                          -DCMAKE_C_COMPILER=clang \
+                          -DCMAKE_CXX_COMPILER=clang++ \
                           -DLIBUNWIND_TARGET_TRIPLE=%s \
                           -DLLVM_DEFAULT_TARGET_TRIPLE=%s \
                           .. \