--- avidemux_plugins/CMakeLists.txt.orig	2021-03-07 06:18:22 UTC
+++ avidemux_plugins/CMakeLists.txt
@@ -266,7 +266,9 @@ ENDIF(DO_COMMON)
 ADD_SUBDIRECTORY(ADM_videoEncoder)
 ADD_SUBDIRECTORY(ADM_videoFilters6)
 IF(DO_QT4)
+    IF(NOT DO_COMMON)
         add_subdirectory(ADM_demuxers/VapourSynth)
+    ENDIF(NOT DO_COMMON)
     #    add_subdirectory(ADM_scriptEngines)
         #IF(USE_OPENGL AND NOT WIN32)
         IF(USE_OPENGL )