Update of contrib stuff from massimo.

contrib/datetime/Makefile

@@ -1,12 +1,62 @@
-D=/usr/postgres
-P=$D/lib/datetime_functions.so
-CFLAGS=-fpic -O -I../../src/include -I../../src/backend
+#-------------------------------------------------------------------------
+#
+# Makefile--
+#    Makefile for new date/time functions.
+#
+#-------------------------------------------------------------------------
 
-all: $P datetime_functions.sql
+PGDIR = ../..
+SRCDIR = $(PGDIR)/src
 
-$P:datetime_functions.o 
-	ld -Bshareable -o $P datetime_functions.o 
+include $(SRCDIR)/Makefile.global
 
-datetime_functions.sql: datetime.prot
-	sh datetime.prot $P
-	psql -c "\idatetime_functions.sql" template1
+INCLUDE_OPT =	-I ./ \
+		-I $(SRCDIR)/ \
+		-I $(SRCDIR)/include \
+		-I $(SRCDIR)/port/$(PORTNAME)
+
+CFLAGS += $(INCLUDE_OPT)
+
+ifeq ($(PORTNAME), linux)
+  ifdef LINUX_ELF
+    ifeq ($(CC), gcc)
+      CFLAGS += -fPIC
+    endif
+  endif
+endif
+
+ifeq ($(PORTNAME), i386_solaris)
+  CFLAGS+= -fPIC
+endif
+
+MODNAME =	datetime_functions
+
+MODULE =	$(MODNAME)$(DLSUFFIX)
+
+all:		module sql
+
+module:		$(MODULE)
+
+sql:		$(MODNAME).sql
+
+install:	$(MODULE)
+		cp -p $(MODULE) $(LIBDIR)
+		cd $(LIBDIR); strip $(MODULE)
+
+%.sql: %.sql.in
+		sed "s|MODULE_PATHNAME|$(LIBDIR)/$(MODULE)|" < $< > $@
+
+.SUFFIXES: $(DLSUFFIX)
+
+%$(DLSUFFIX): %.c
+		cc $(CFLAGS) -shared -o $@ $<
+
+depend dep:
+		$(CC) -MM $(INCLUDE_OPT) *.c >depend
+
+clean:
+		rm -f $(MODULE) $(MODNAME).sql
+
+ifeq (depend,$(wildcard depend))
+include depend
+endif