diff -up qwt-6.1.2/qwtfunctions.pri.qt5 qwt-6.1.2/qwtfunctions.pri

--- qwt-6.1.2/qwtfunctions.pri.qt5	2014-12-11 08:13:13.511186492 -0600

+++ qwt-6.1.2/qwtfunctions.pri	2014-12-12 20:45:24.556261966 -0600

@@ -12,7 +12,12 @@

 defineReplace(qwtLibraryTarget) {

     unset(LIBRARY_NAME)

+

+    greaterThan(QT_MAJOR_VERSION, 4) {

+    LIBRARY_NAME = $${1}-qt$${QT_MAJOR_VERSION}

+    } else {

     LIBRARY_NAME = $$1

+    }

     mac:contains(QWT_CONFIG, QwtFramework) {

@@ -36,7 +41,11 @@ defineReplace(qwtLibraryTarget) {

 defineTest(qwtAddLibrary) {

     LIB_PATH = $$1

+    greaterThan(QT_MAJOR_VERSION, 4) {

+    LIB_NAME = $${2}-qt$${QT_MAJOR_VERSION}

+    } else {

     LIB_NAME = $$2

+    }

     mac:contains(QWT_CONFIG, QwtFramework) {