diff --git a/input/sum/Makefile.am b/input/sum/Makefile.am
index f129193..33fa849 100644
--- a/input/sum/Makefile.am
+++ b/input/sum/Makefile.am
@@ -1,8 +1,8 @@
-AM_CPPFLAGS = -I$(top_srcdir)/include
+AM_CPPFLAGS = -I$(top_srcdir)/include $(LIBNETFILTER_ACCT_CFLAGS) $(LIBMNL_CFLAGS)
 AM_CFLAGS = ${regular_CFLAGS}
 
 pkglib_LTLIBRARIES = ulogd_inpflow_NFACCT.la
 
 ulogd_inpflow_NFACCT_la_SOURCES = ulogd_inpflow_NFACCT.c
-ulogd_inpflow_NFACCT_la_LDFLAGS = -avoid-version -module $(LIBMNL_LIBS) $(LIBNETFILTER_ACCT_LIBS)
-ulogd_inpflow_NFACCT_la_CFLAGS = $(AM_CFLAGS) $(LIBMNL_LIBS) $(LIBNETFILTER_ACCT_CFLAGS)
+ulogd_inpflow_NFACCT_la_LDFLAGS = -avoid-version -module
+ulogd_inpflow_NFACCT_la_LIBADD  = $(LIBMNL_LIBS) $(LIBNETFILTER_ACCT_LIBS)