libdl {
  GLIBC_2.0 {
    dladdr; dlclose; dlerror; dlopen; dlsym;
  }
  GLIBC_2.1 {
    dlopen; dlvsym;
  }
  GLIBC_2.3.3 {
    dladdr1; dlinfo;
  }
  GLIBC_2.3.4 {
    dlmopen;
  }
  GLIBC_PRIVATE {
    _dlfcn_hook;
  }
}