pqclean macOS

cc -O3 -Wall -Wextra -Wpedantic -Wvla -Werror -Wmissing-prototypes -Wredundant-decls -std=c99 -Wcast-align -mavx2 -mbmi -mpopcnt -I../../../common  -c -o rejsample.o rejsample.c
rejsample.c:284:44: error: expected expression
        d = _mm256_loadu_si256((__m256i_u *)vec);
                                           ^
rejsample.c:284:33: error: use of undeclared identifier '__m256i_u'
        d = _mm256_loadu_si256((__m256i_u *)vec);
                                ^
rejsample.c:288:51: error: expected expression
        __m128i rid = _mm_loadl_epi64((__m128i_u *)&idx[good]);