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drm-kmod doesn't expose uAPI yet, so bundle like Mesa
--- libavutil/hwcontext_drm.c.orig 2022-07-22 17:58:39 UTC
+++ libavutil/hwcontext_drm.c
@@ -28,6 +28,19 @@
#if HAVE_LINUX_DMA_BUF_H
#include <linux/dma-buf.h>
#include <sys/ioctl.h>
+#else // BSDs
+#undef HAVE_LINUX_DMA_BUF_H
+#define HAVE_LINUX_DMA_BUF_H 1
+#include <sys/ioctl.h>
+struct dma_buf_sync {
+ uint64_t flags;
+};
+#define DMA_BUF_BASE 'b'
+#define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync)
+#define DMA_BUF_SYNC_READ (1 << 0)
+#define DMA_BUF_SYNC_WRITE (2 << 0)
+#define DMA_BUF_SYNC_START (0 << 2)
+#define DMA_BUF_SYNC_END (1 << 2)
#endif
#include <drm.h>
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