--- gnuradio-3.7.13.4/cmake/Modules/FindQwt.cmake~	2018-07-15 18:09:20.000000000 +0200
+++ gnuradio-3.7.13.4/cmake/Modules/FindQwt.cmake	2019-03-30 10:40:11.744273836 +0100
@@ -15,6 +15,7 @@
   /usr/local/include/qwt
   /usr/include/qwt6
   /usr/include/qwt-qt4
+  /usr/include/qt4/qwt
   /usr/include/qwt
   /usr/include/qwt5
   /opt/local/include/qwt