Mac下链接生成动态库失败

Mac编译正确，链接生成静态库也没问题，但是链接生成动态库时出现报错，查阅了一些资料也没解决，菜鸟一枚，只能在此请教了，报错如下，望大神解惑：
Linking libbrpc.dylib
Undefined symbols for architecture x86_64:
"_CRYPTO_THREADID_set_callback", referenced from:
brpc::SSLThreadInit() in ssl_helper.o
"_CRYPTO_THREADID_set_numeric", referenced from:
brpc::SSLGetThreadId(crypto_threadid_st*) in ssl_helper.o
"_EVP_PKEY_base_id", referenced from:
brpc::SSLGetDHCallback(ssl_st*, int, int) in ssl_helper.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libbrpc.dylib] Error 1