fix clang compile error

diff --git a/riscv/mmu.h b/riscv/mmu.h
index 4ca9d0aaedce911aba7ff4eb7144a56b2ef253fd..ddb1d51e1fa8b4d23ff40e2a96aa2102c89aa16f 100644 (file)
--- a/riscv/mmu.h
+++ b/riscv/mmu.h
@@ -9,6 +9,7 @@
 #include "config.h"
 #include "processor.h"
 #include "memtracer.h"
+#include <stdlib.h>
 #include <vector>
 
 // virtual memory configuration