diff -ruwN source/rsync.h source-new/rsync.h
--- source/rsync.h	2025-01-16 02:21:54.000000000 +0700
+++ source-new/rsync.h	2025-09-08 12:18:06.427647717 +0700
@@ -483,6 +483,21 @@
 #include <sys/sysmacros.h>
 #endif
 
+#ifdef __redox__
+
+// no sys/sysmacros.h, probably no problem
+#include <sys/types.h>
+#define major(dev) (0)
+#define minor(dev) (0)
+#define makedev(maj, min) (0)
+
+// no openat yet
+#undef O_NOFOLLOW
+#undef O_DIRECTORY
+#undef AT_FDCWD
+
+#endif
+
 #ifdef MAKEDEV_TAKES_3_ARGS
 #define MAKEDEV(devmajor,devminor) makedev(0,devmajor,devminor)
 #else