In file included from muse/mixer/rack.cpp:49:
muse/components/plugindialog.h:4:10: fatal error: 'ui_plugindialogbase.h' file not found
#include "ui_plugindialogbase.h"
         ^~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

--- muse/mixer/CMakeLists.txt.orig	2021-04-08 11:35:45 UTC
+++ muse/mixer/CMakeLists.txt
@@ -64,6 +64,8 @@ add_library ( mixer ${MODULES_BUILD}
       ${mixer_uis}
       )
 
+add_dependencies(mixer components)
+
 ##
 ## Append to the list of translations
 ##