undefined reference to `dlopen' 解决方法

/lib/libpthread.so.0: undefined reference to `dlopen'

lib/libpthread.so.0: undefined reference to `dlclose'

lib/libpthread.so.0: undefined reference to `dlsym'

libcrypto.so: undefined reference to `dlerror'

libcrypto.so: undefined reference to `dladdr'

在Makefile中添加动态库引用如

SO_LIBS = pthread rt dl