-SET(sed_match "^[[:space:]]*__ipt_module(\\(.*\\)).*")
-SET(sed_replace "-Wl,--undefined=libxt_\\1_init -Wl,--undefined=libipt_\\1_init -Wl,--undefined=libip6t_\\1_init")
-
-EXECUTE_PROCESS(COMMAND sed -n -e "s/${sed_match}/${sed_replace}/; T n; H; :n; \${ x; s/^\\n//; s/\\n/ /gp }" ${CMAKE_SOURCE_DIR}/iptables.h
- OUTPUT_VARIABLE ext_syms OUTPUT_STRIP_TRAILING_WHITESPACE)
-