diff --git a/build-ffvpx.patch b/build-ffvpx.patch
new file mode 100644
index 0000000..09e60bb
--- /dev/null
+++ b/build-ffvpx.patch
@@ -0,0 +1,24 @@
+diff -up thunderbird-128.0/media/ffvpx/libavcodec/av1dec.c.build-ffvpx thunderbird-128.0/media/ffvpx/libavcodec/av1dec.c
+--- thunderbird-128.0/media/ffvpx/libavcodec/av1dec.c.build-ffvpx	2024-06-24 22:43:40.000000000 +0200
++++ thunderbird-128.0/media/ffvpx/libavcodec/av1dec.c	2024-07-10 11:20:23.200948767 +0200
+@@ -887,7 +887,7 @@ static av_cold int av1_decode_init(AVCod
+         ff_cbs_fragment_reset(&s->current_obu);
+     }
+ 
+-    s->dovi.logctx = avctx;
++    s->dovi.logctx = (AVContext *) avctx;
+     s->dovi.dv_profile = 10; // default for AV1
+     sd = ff_get_coded_side_data(avctx, AV_PKT_DATA_DOVI_CONF);
+     if (sd && sd->size > 0)
+diff -up thunderbird-128.0/media/ffvpx/libavcodec/libdav1d.c.build-ffvpx thunderbird-128.0/media/ffvpx/libavcodec/libdav1d.c
+--- thunderbird-128.0/media/ffvpx/libavcodec/libdav1d.c.build-ffvpx	2024-07-10 12:46:57.005539959 +0200
++++ thunderbird-128.0/media/ffvpx/libavcodec/libdav1d.c	2024-07-10 12:47:19.067507705 +0200
+@@ -289,7 +289,7 @@ static av_cold int libdav1d_init(AVCodec
+     c->delay = res > 1 ? res : 0;
+ #endif
+ 
+-    dav1d->dovi.logctx = c;
++    dav1d->dovi.logctx = (AVContext *) c;
+     dav1d->dovi.dv_profile = 10; // default for AV1
+     sd = ff_get_coded_side_data(c, AV_PKT_DATA_DOVI_CONF);
+     if (sd && sd->size > 0)