Index: pipewire-0.3.0/src/examples/video-src-alloc.c
===================================================================
--- pipewire-0.3.0.orig/src/examples/video-src-alloc.c
+++ pipewire-0.3.0/src/examples/video-src-alloc.c
@@ -29,6 +29,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/mman.h>
+#include <sys/syscall.h>
 
 #include <spa/param/video/format-utils.h>
 #include <spa/param/props.h>
@@ -45,6 +46,46 @@
 
 #define M_PI_M2 ( M_PI + M_PI )
 
+#if !defined(HAVE_MEMFD_CREATE)
+/*
+ * No glibc wrappers exist for memfd_create(2), so provide our own.
+ *
+ * Also define memfd fcntl sealing macros. While they are already
+ * defined in the kernel header file <linux/fcntl.h>, that file as
+ * a whole conflicts with the original glibc header <fnctl.h>.
+ */
+
+static inline int memfd_create(const char *name, unsigned int flags)
+{
+        return syscall(SYS_memfd_create, name, flags);
+}
+#endif
+
+#ifndef MFD_CLOEXEC
+#define MFD_CLOEXEC       0x0001U
+#endif
+
+#ifndef MFD_ALLOW_SEALING
+#define MFD_ALLOW_SEALING 0x0002U
+#endif
+
+/* fcntl() seals-related flags */
+
+#ifndef F_LINUX_SPECIFIC_BASE
+#define F_LINUX_SPECIFIC_BASE 1024
+#endif
+
+#ifndef F_ADD_SEALS
+#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
+#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
+
+#define F_SEAL_SEAL     0x0001  /* prevent further seals from being set */
+#define F_SEAL_SHRINK   0x0002  /* prevent file from shrinking */
+#define F_SEAL_GROW     0x0004  /* prevent file from growing */
+#define F_SEAL_WRITE    0x0008  /* prevent writes */
+#endif
+
+
 struct data {
 	struct pw_main_loop *loop;
 	struct spa_source *timer;