on preproc.h, else make may try to build it before preproc.h is ready.
Per failures seen here and in buildfarm.
#
# Copyright (c) 1998-2007, PostgreSQL Global Development Group
#
-# $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/Makefile,v 1.124 2007/03/17 19:25:23 meskes Exp $
+# $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/Makefile,v 1.125 2007/03/18 17:57:34 tgl Exp $
#
#-------------------------------------------------------------------------
@$(missing) flex $< $@
endif
-c_keywords.o ecpg_keywords.o keywords.o preproc.o: preproc.h
+c_keywords.o ecpg_keywords.o keywords.o preproc.o parser.o: preproc.h
parser.c: $(top_srcdir)/src/backend/parser/parser.c
rm -f $@ && $(LN_S) $< .