diff --git a/cpu.cpp b/cpu.cpp
index ba33be41..9f190508 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -30,6 +30,12 @@
 #if CRYPTOPP_GETAUXV_AVAILABLE
 # include <sys/auxv.h>
 #else
+#ifndef AT_HWCAP
+#define AT_HWCAP 16
+#endif
+#ifndef AT_HWCAP2
+#define AT_HWCAP2 26
+#endif
 unsigned long int getauxval(unsigned long int) { return 0; }
 #endif