diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,7 +41,7 @@ set(BUILD_QWT true CACHE BOOL "Download 
 if (BUILD_QWT)
   include(BuildQwt)
 else (BUILD_QWT)
-    find_package(Qwt 6.1 REQUIRED)
+    find_package(Qwt 6.1.5 REQUIRED)
 endif (BUILD_QWT)
 
 # includes
@@ -127,9 +127,9 @@ add_executable(${PROGRAM_NAME} WIN32
   src/barchart.cpp
   src/barscaledraw.cpp
   src/numberformat.cpp
-  src/updatechecker.cpp
+  #  src/updatechecker.cpp
   src/versionnumber.cpp
-  src/updatecheckdialog.cpp
+#src/updatecheckdialog.cpp
   src/samplepack.cpp
   src/source.cpp
   src/sink.cpp