diff --git a/devel/simavr/files/patch-simavr_sim_sim__vcd__file.c b/devel/simavr/files/patch-simavr_sim_sim__vcd__file.c
new file mode 100644
index 000000000000..388831300642
--- /dev/null
+++ b/devel/simavr/files/patch-simavr_sim_sim__vcd__file.c
@@ -0,0 +1,10 @@
+--- simavr/sim/sim_vcd_file.c.orig	2026-06-26 12:23:48 UTC
++++ simavr/sim/sim_vcd_file.c
+@@ -34,6 +34,7 @@ DEFINE_FIFO(avr_vcd_log_t, avr_vcd_fifo);
+ 
+ DEFINE_FIFO(avr_vcd_log_t, avr_vcd_fifo);
+ 
++#undef strdupa
+ #define strdupa(__s) strcpy(alloca(strlen(__s)+1), __s)
+ 
+ static void