+async_hdrs: $(DSTROOT)$(PRIVATE_HDR_INSTALLDIR)$(ASYNC_HEADER_DIR_SUFFIX)
+ $(SILENT) $(FASTCP) $(ASYNC_HDRS) $(DSTROOT)$(PRIVATE_HDR_INSTALLDIR)$(ASYNC_HEADER_DIR_SUFFIX)
+
+$(DSTROOT)$(PRIVATE_HDR_INSTALLDIR)$(ASYNC_HEADER_DIR_SUFFIX):
+ $(MKDIRS) $@
+