--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -141,6 +141,10 @@
 #include "fd-trans.h"
 #include "tcg/tcg.h"
 
+#ifndef RLIMIT_RTTIME
+#define RLIMIT_RTTIME 15
+#endif
+
 #ifndef CLONE_IO
 #define CLONE_IO                0x80000000      /* Clone io context */
 #endif