diff --git a/libcxx/lib/buildit b/libcxx/lib/buildit
index 0b51b2d7f0ff..9bc162206e76 100755
--- a/libcxx/lib/buildit
+++ b/libcxx/lib/buildit
@@ -62,7 +62,7 @@ case $TRIPLE in
     SOEXT=so
     LDSHARED_FLAGS="-o libc++.so.1.0 \
         -shared -nodefaultlibs -Wl,-soname,libc++.so.1 \
-        -lstdc++ -lc"
+        -lpthread -lrt -lc"
     ;;
 esac