diff --git a/build-libcxx.sh b/build-libcxx.sh
index 304dec5..e31769f 100755
--- a/build-libcxx.sh
+++ b/build-libcxx.sh
@@ -156,11 +156,8 @@ build_all() {
             -DLIBCXX_ENABLE_EXCEPTIONS=ON \
             -DLIBCXX_ENABLE_THREADS=ON \
             -DLIBCXX_HAS_WIN32_THREAD_API=ON \
-            -DLIBCXX_ENABLE_MONOTONIC_CLOCK=ON \
             -DLIBCXX_ENABLE_SHARED=$SHARED \
             -DLIBCXX_ENABLE_STATIC=$STATIC \
-            -DLIBCXX_SUPPORTS_STD_EQ_CXX11_FLAG=TRUE \
-            -DLIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB=TRUE \
             -DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF \
             -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=TRUE \
             -DLIBCXX_ENABLE_NEW_DELETE_DEFINITIONS=ON \