Contrib port/ usage is same as others so no need for rules.

contrib/pg_controldata/Makefile

-# $Header: /cvsroot/pgsql/contrib/pg_controldata/Attic/Makefile,v 1.6 2002/07/18 03:59:49 momjian Exp $
+# $Header: /cvsroot/pgsql/contrib/pg_controldata/Attic/Makefile,v 1.7 2002/07/18 04:33:39 momjian Exp $
 
 subdir = contrib/pg_controldata
 top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 
 PROGRAM = pg_controldata
-OBJS	= pg_controldata.o pg_crc.o $(notdir $(SNPRINTF))
+OBJS	= pg_controldata.o pg_crc.o $(SNPRINTF)
 
 pg_crc.c: $(top_srcdir)/src/backend/utils/hash/pg_crc.c
 	rm -f $@ && $(LN_S) $< .
 
-ifdef SNPRINTF
-$(basename $(notdir $(SNPRINTF))).c: $(basename $(SNPRINTF)).c
-	rm -f $@ && $(LN_S) $< .
-endif
-
 EXTRA_CLEAN = pg_crc.c snprintf.c
 
 DOCS = README.pg_controldata

contrib/pg_resetxlog/Makefile

-# $Header: /cvsroot/pgsql/contrib/pg_resetxlog/Attic/Makefile,v 1.4 2002/07/18 03:59:49 momjian Exp $
+# $Header: /cvsroot/pgsql/contrib/pg_resetxlog/Attic/Makefile,v 1.5 2002/07/18 04:33:39 momjian Exp $
 
 subdir = contrib/pg_resetxlog
 top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 
 PROGRAM = pg_resetxlog
-OBJS	= pg_resetxlog.o pg_crc.o $(notdir $(SNPRINTF))
+OBJS	= pg_resetxlog.o pg_crc.o $(SNPRINTF)
 
 pg_crc.c: $(top_srcdir)/src/backend/utils/hash/pg_crc.c
 	rm -f $@ && $(LN_S) $< .
 
-ifdef SNPRINTF
-$(basename $(notdir $(SNPRINTF))).c: $(basename $(SNPRINTF)).c
-	rm -f $@ && $(LN_S) $< .
-endif
-
 EXTRA_CLEAN = pg_crc.c snprintf.c
 
 DOCS = README.pg_resetxlog