--- qwt.prf.orig	2017-10-06 14:51:04 UTC
+++ qwt.prf
@@ -34,4 +34,4 @@ else {
 }   
 
 # QMAKE_RPATHDIR *= $${QWT_INSTALL_LIBS}
-qwtAddLibrary($${QWT_INSTALL_LIBS}, qwt)
+qwtAddLibrary($${QWT_INSTALL_LIBS}, qwt6)