fatal error 'variant4_random_math.h' file not found 
When I try to make the libhash.io file i get this error:

`$ make -f Makefile
gcc -O3 -shared -pthread -fPIC -g -Wall -std=gnu99 -maes   -c -o cryptonight.o cryptonight.c
clang: warning: argument unused during compilation: '-shared' [-Wunused-command-line-argument]
cryptonight.c:11:10: fatal error: 'variant4_random_math.h' file not found
#include "variant4_random_math.h"
         ^~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [cryptonight.o] Error 1`

Is there anything I'am doing wrong?