Be able to easily figure out the target directory of "make dist".

GNUmakefile.in

 #
 # PostgreSQL top level makefile
 #
-# $PostgreSQL: pgsql/GNUmakefile.in,v 1.52 2009/08/09 22:47:58 petere Exp $
+# $PostgreSQL: pgsql/GNUmakefile.in,v 1.53 2009/08/14 21:37:18 alvherre Exp $
 #
 
 subdir =
@@ -99,6 +99,9 @@ postgresql-opt-$(VERSION).tar: distdir
 postgresql-test-$(VERSION).tar: distdir
 	$(TAR) cf $@ $(distdir)/src/test
 
+distdir-location:
+	@echo $(distdir)
+
 distdir:
 	rm -rf $(distdir)* $(dummy)
 	for x in `cd $(top_srcdir) && find . \( -name CVS -prune \) -o \( -name .git -prune \) -o -print`; do \