I forgot to attach the patch, not it should be OK

cpio-2.11-temporary-allow-build.patch

@@ -0,0 +1,15 @@
+diff --git a/gnu/fcntl.in.h b/gnu/fcntl.in.h
+index 95298de..a9a8ddd 100644
+--- a/gnu/fcntl.in.h
++++ b/gnu/fcntl.in.h
+@@ -216,6 +216,10 @@ _GL_WARN_ON_USE (openat, "openat is not portable - "
+ # define O_SYNC 0
+ #endif
+ 
++#ifndef __O_SYNC
++# define __O_SYNC 04000000
++#endif
++
+ #ifndef O_TTY_INIT
+ # define O_TTY_INIT 0
+ #endif