diff --git a/platforms/unix/config/acinclude.m4 b/platforms/unix/config/acinclude.m4
index 4d31381947..0d245c3ee9 100644
--- a/platforms/unix/config/acinclude.m4
+++ b/platforms/unix/config/acinclude.m4
@@ -282,7 +282,6 @@ AC_DEFUN([AC_PLUGIN_CHECK_LIB],[
     disabled_plugins="${disabled_plugins} ${plugin}")])
 
 # Recent Unix stuff
-m4_include([ax_append_link_flags.m4])
 m4_include([ax_have_epoll.m4])
 m4_include([ax_pthread.m4])
 m4_include([ax_cflags_warn_all.m4])