diff --git a/audio/guitarix-lv2/files/patch-git_d8f003 b/audio/guitarix-lv2/files/patch-git_d8f003
new file mode 100644
index 000000000000..88c242afec8c
--- /dev/null
+++ b/audio/guitarix-lv2/files/patch-git_d8f003
@@ -0,0 +1,12 @@
+https://sourceforge.net/p/guitarix/git/ci/d8f003484c57d808682025dfb07a7a1fb848afdc/
+Issue #63 - Fix build on gcc 11
+
+--- src/headers/gx_system.h.orig
++++ src/headers/gx_system.h
+@@ -132,7 +132,7 @@
+ 
+ template <class T>
+ inline bool atomic_compare_and_exchange(T **p, T *oldv, T *newv) {
+-    return g_atomic_pointer_compare_and_exchange(reinterpret_cast<void* volatile*>(p), static_cast<void*>(oldv), newv);
++    return g_atomic_pointer_compare_and_exchange(reinterpret_cast<void**>(p), static_cast<void*>(oldv), newv);
+ }