$NetBSD: patch-qwt.prf,v 1.2 2020/06/09 07:01:55 mef Exp $

Needs to add QWT_INSTALL_LIBS to RPATH 

--- qwt.prf.orig	2019-10-27 11:19:56.445946771 +0100
+++ qwt.prf	2019-10-27 11:20:03.718973346 +0100
@@ -33,5 +33,5 @@
     INCLUDEPATH *= $${QWT_INSTALL_HEADERS}
 }   
 
-# QMAKE_RPATHDIR *= $${QWT_INSTALL_LIBS}
+QMAKE_RPATHDIR *= $${QWT_INSTALL_LIBS}
 qwtAddLibrary($${QWT_INSTALL_LIBS}, qwt)