building bug

[cxwx]

Describe the bug
[ 33%] Building CXX object test/CMakeFiles/test_sse2.dir/test_main.cpp.o
[ 33%] Building CXX object test/CMakeFiles/test_avx2.dir/test_main.cpp.o
[ 50%] Building CXX object test/CMakeFiles/test_scalar.dir/test_main.cpp.o
In file included from /Users/cx/software/cpp/tmp/xxhash_cpp/test/test_main.cpp:15:
In file included from /Users/cx/software/cpp/tmp/xxhash_cpp/test/xxh3.h:55:
/Users/cx/software/cpp/tmp/xxhash_cpp/test/xxhash.h:4262:13: error: unknown type name '__m256i'
4262 | { __m256i* const xacc = (__m256i*) acc;
| ^
/Users/cx/software/cpp/tmp/xxhash_cpp/test/xxhash.h:4262:36: error: use of undeclared identifier '__m256i'
4262 | { __m256i* const xacc = (__m256i*) acc;

To Reproduce
Steps to reproduce the behavior:

brew reinstall sse2neon
mkdir build
cd build
cmake ../
make


**Desktop (please complete the following information):**
 - OS: macos 15.2 (M1)