mac下的openssl 调用HMAC函数， 需要链接那个dylib？

错误：

Undefined symbols for architecture x86_64:
"_EVP_sha1", referenced from:
_hmacSha1 in functions.o
"_HMAC", referenced from:
_hmacSha1 in functions.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)