--- ettercap/utils/etterfilter/Makefile.am~	2011-12-21 18:11:40.000000000 +0000
+++ ettercap/utils/etterfilter/Makefile.am	2011-12-21 18:14:58.000000000 +0000
@@ -24,6 +24,8 @@
                       $(top_srcdir)/src/ec_file.c \
                       $(top_srcdir)/src/ec_filter.c \
                       $(top_srcdir)/src/ec_strings.c
+
+BUILT_SOURCES = ef_grammar.c
 
 noinst_HEADERS = ef_grammar.h