diff --git a/src/interfaces/Makefile b/src/interfaces/Makefile
index b6a0af02d8..e2fa6d6e3a 100644
--- a/src/interfaces/Makefile
+++ b/src/interfaces/Makefile
@@ -7,7 +7,7 @@
 #
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/interfaces/Makefile,v 1.35 2000/04/20 17:21:46 momjian Exp $
+#    $Header: /cvsroot/pgsql/src/interfaces/Makefile,v 1.36 2000/04/23 04:26:31 tgl Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -53,7 +53,7 @@ install-perl5: perl5/Makefile
 	$(MAKE) -C perl5 clean
 	cd perl5 && POSTGRES_HOME="$(POSTGRESDIR)" $(PERL) Makefile.PL POLLUTE=1
 	$(MAKE) -C perl5 all
-	-@if [ -w `sed -n -e 's/^ *INSTALLSITELIB *= *//p' perl5/Makefile` ]; then \
+	-@if [ -w `$(MAKE) --quiet -C perl5 echo-installdir` ]; then \
 		$(MAKE) $(MFLAGS) -C perl5 install; \
 		rm -f perl5/Makefile; \
 	else \
diff --git a/src/interfaces/perl5/Makefile.PL b/src/interfaces/perl5/Makefile.PL
index 147c0bd1e4..d63c7e7ad5 100644
--- a/src/interfaces/perl5/Makefile.PL
+++ b/src/interfaces/perl5/Makefile.PL
@@ -1,6 +1,6 @@
 #-------------------------------------------------------
 #
-# $Id: Makefile.PL,v 1.14 1998/10/18 02:36:48 tgl Exp $
+# $Id: Makefile.PL,v 1.15 2000/04/23 04:26:32 tgl Exp $
 #
 # Copyright (c) 1997, 1998  Edmund Mergl
 #
@@ -53,6 +53,14 @@ where Postgres is installed (often /usr/local/pgsql).\n";
 
 WriteMakefile(%opts);
 
-exit(0);
 
-# end of Makefile.PL
+sub MY::installbin { 
+
+q[
+# Create a target that interfaces/Makefile can use to
+# determine the Perl install directory.
+echo-installdir:
+	@echo $(INSTALLSITELIB)
+];
+
+}