diff --git a/qwt/qwtbuild.pri b/qwt/qwtbuild.pri
index b224301d3..ddbcfc6ea 100644
--- a/qwt/qwtbuild.pri
+++ b/qwt/qwtbuild.pri
@@ -14,9 +14,11 @@
 CONFIG           += qt     
 CONFIG           += warn_on
 CONFIG           += no_keywords
-#CONFIG           += silent
+CONFIG           += silent
 CONFIG           += static
 
+DEFINES += QT_NO_DEPRECATED_WARNINGS # not fixing those before Qwt 6.2
+
 ######################################################################
 # release/debug mode
 ######################################################################
@@ -53,6 +55,9 @@ linux-g++ | linux-g++-64 {
     #QMAKE_CXXFLAGS   *= -Werror=format-security
     #QMAKE_CXXFLAGS   *= -std=c++11
 
+    # avoid warnings since gcc9
+    # QMAKE_CXXFLAGS   *= -Wno-deprecated-copy
+
     # when using the gold linker ( Qt < 4.8 ) - might be 
     # necessary on non linux systems too
     #QMAKE_LFLAGS += -lrt