diff --git a/audio/carla/files/patch-source_utils_CarlaPluginUI.cpp b/audio/carla/files/patch-source_utils_CarlaPluginUI.cpp
new file mode 100644
index 000000000000..10415d82633f
--- /dev/null
+++ b/audio/carla/files/patch-source_utils_CarlaPluginUI.cpp
@@ -0,0 +1,10 @@
+--- source/utils/CarlaPluginUI.cpp.orig	2021-11-03 18:15:18 UTC
++++ source/utils/CarlaPluginUI.cpp
+@@ -19,6 +19,7 @@
+ #include "CarlaPluginUI.hpp"
+ 
+ #ifdef HAVE_X11
++# include <pthread.h>
+ # include <sys/types.h>
+ # include <X11/Xatom.h>
+ # include <X11/Xlib.h>