最近在做使用openssl链接http和https的项目,编译时出现以下问题. /usr/local/openssl/lib/libcrypto.a(async.o): In function `async_free_pool_internal':async.c:(.text+0xe4): undefined reference to `pthread_setspecific'async.c:(.text+0xf4): undefined reference to `pthread_getspe…