diff --git a/libcxx/Makefile b/libcxx/Makefile
index 0c8177dbb9c2..c180271e7e5a 100644
--- a/libcxx/Makefile
+++ b/libcxx/Makefile
@@ -32,17 +32,6 @@ clean::
 
 installheaders:: do-installhdrs
 
-# The do-installhdrs target is also used by clang's runtime/libcxx makefile.
-do-installhdrs:
-	mkdir -p $(HEADER_DIR)/c++/v1/ext
-	rsync -r --exclude=".*" --exclude="support" $(SRCDIRS)/include/* \
-	  $(HEADER_DIR)/c++/v1/
-	chown -R root:wheel $(HEADER_DIR)/c++
-	chmod 755 $(HEADER_DIR)/c++/v1
-	chmod 644 $(HEADER_DIR)/c++/v1/*
-	chmod 755 $(HEADER_DIR)/c++/v1/ext
-	chmod 644 $(HEADER_DIR)/c++/v1/ext/*
-
 install::
 
 	cd lib && ./buildit