$NetBSD: patch-configure.ac,v 1.1 2015/04/23 06:50:41 dbj Exp $

--- configure.ac.orig	2013-02-21 20:19:23.000000000 +0000
+++ configure.ac
@@ -1927,8 +1927,10 @@ OCTAVE_PROG_BISON
 AC_PROG_LN_S
 
 AC_PROG_INSTALL
-INSTALL_SCRIPT='${INSTALL}'
+test -z "$INSTALL_SCRIPT" && INSTALL_SCRIPT='${INSTALL}'
 AC_SUBST(INSTALL_SCRIPT)
+test -z "$INSTALL_LIB" && INSTALL_LIB='${INSTALL_SCRIPT}'
+AC_SUBST(INSTALL_LIB)
 
 OCTAVE_PROG_DESKTOP_FILE_INSTALL