--- /dev/null
+Description: fix missing standard-includes
+ size_t requires <csstddef>
+Author: IOhannes m zmölnig
+Origin: Debian
+Bug: https://github.com/monocasual/giada/issues/570
+Last-Update: 2022-03-03
+---
+This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
+--- giada.orig/src/gui/elems/basics/flex.cpp
++++ giada/src/gui/elems/basics/flex.cpp
+@@ -1,5 +1,6 @@
+ #include "flex.h"
+ #include <numeric>
++#include <cstddef>
+
+ namespace giada::v
+ {
+@@ -133,4 +134,4 @@
+ Fl_Group::end();
+ resize(x(), y(), w(), h());
+ }
+-} // namespace giada::v
+\ No newline at end of file
++} // namespace giada::v