diff -Naur a/config.pri b/config.pri
--- a/config.pri	2018-06-28 02:41:36.000000000 +0200
+++ b/config.pri	2018-07-01 10:56:47.788908801 +0200
@@ -285,8 +285,8 @@
         exists (/usr/include/qwt-qt4) {INCLUDEPATH+=/usr/include/qwt-qt4}
 	exists(/usr/include/qwt5-qt4) {INCLUDEPATH+=/usr/include/qwt5-qt4}
 
-        system (ls /usr/lib*/libqwt5.so) {
-           LIBS+=-lqwt5
+        system (ls /usr/lib*/libqwt5-qt4.so) {
+           LIBS+=-lqwt5-qt4
         } else {
            system (ls /usr/lib*/libqwt5-qt4.so) {
               LIBS+=-lqwt5-qt4