diff --git a/Makefile.uk b/Makefile.uk
index 9261779174d454df065cf3caff7afe7b9e3eb00f..34459d722e345b4def695a60ad0573cdc9765b70 100644
--- a/Makefile.uk
+++ b/Makefile.uk
@@ -53,8 +53,11 @@ endif
 LIBCXX_VERSION=14.0.6
 LIBCXX_URL=https://github.com/llvm/llvm-project/releases/download/llvmorg-$(LIBCXX_VERSION)/libcxx-$(LIBCXX_VERSION).src.tar.xz
 LIBCXX_PATCHDIR=$(LIBCXX_BASE)/patches
+
+ifeq ($(CONFIG_LIBCXX),y)
 $(eval $(call fetch,libcxx,$(LIBCXX_URL)))
 $(eval $(call patch,libcxx,$(LIBCXX_PATCHDIR),libcxx-$(LIBCXX_VERSION).src))
+endif
 
 ################################################################################
 # Helpers