diff --git a/app-misc/gnote/files/gnote-3.38.1-cstddef.patch b/app-misc/gnote/files/gnote-3.38.1-cstddef.patch
new file mode 100644
index 0000000..716ae29
--- /dev/null
+++ b/app-misc/gnote/files/gnote-3.38.1-cstddef.patch
@@ -0,0 +1,34 @@
+https://bugs.gentoo.org/768198
+
+From 49e652613a1e28f1220f593ba18108839d3d2505 Mon Sep 17 00:00:00 2001
+From: Bastien Nocera <hadess@hadess.net>
+Date: Mon, 22 Mar 2021 15:04:01 +0100
+Subject: [PATCH] Fix AbstractAddin compilation error
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+gnote/src/abstractaddin.cpp: In constructor ‘gnote::AbstractAddin::AbstractAddin()’:
+gnote/src/abstractaddin.cpp:29:15: error: ‘NULL’ was not declared in this scope
+   29 |     : m_gnote(NULL)
+      |               ^~~~
+gnote/src/abstractaddin.cpp:25:1: note: ‘NULL’ is defined in header ‘<cstddef>’; did you forget to ‘#include <cstddef>’?
+   24 | #include "abstractaddin.hpp"
+  +++ |+#include <cstddef>
+   25 |
+---
+ src/abstractaddin.cpp | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/src/abstractaddin.cpp
++++ b/src/abstractaddin.cpp
+@@ -22,6 +22,7 @@
+ 
+ 
+ #include "abstractaddin.hpp"
++#include <cstddef>
+ 
+ namespace gnote {
+ 
+-- 
+2.31.1