make install failed in VPATH build.

src/pl/tcl/modules/Makefile

-# $Header: /cvsroot/pgsql/src/pl/tcl/modules/Makefile,v 1.1 2001/05/11 23:38:06 petere Exp $
+# $Header: /cvsroot/pgsql/src/pl/tcl/modules/Makefile,v 1.2 2002/01/08 23:40:02 tgl Exp $
 
 subdir = src/pl/tcl/modules
 top_builddir = ../../../..
@@ -16,7 +16,7 @@ install: all installdirs
 	$(INSTALL_SCRIPT) pltcl_loadmod $(DESTDIR)$(bindir)/pltcl_loadmod
 	$(INSTALL_SCRIPT) pltcl_delmod 	$(DESTDIR)$(bindir)/pltcl_delmod
 	$(INSTALL_SCRIPT) pltcl_listmod $(DESTDIR)$(bindir)/pltcl_listmod
-	$(INSTALL_DATA) unknown.pltcl $(DESTDIR)$(datadir)/unknown.pltcl
+	$(INSTALL_DATA) $(srcdir)/unknown.pltcl $(DESTDIR)$(datadir)/unknown.pltcl
 
 installdirs:
 	$(mkinstalldirs) $(DESTDIR)$(bindir) $(DESTDIR)$(datadir)