GLIBC_2.0 {
  global:
    dladdr; dlclose; dlerror; dlopen; dlsym;
  local:
    *;
};
GLIBC_2.2 {
  global:
    dlopen; dlvsym;
} GLIBC_2.0;
GLIBC_2.3.3 {
  global:
    dladdr1; dlinfo;
} GLIBC_2.2;
GLIBC_2.3.4 {
  global:
    dlmopen;
} GLIBC_2.3.3;
GLIBC_PRIVATE {
  global:
    _dlfcn_hook;
} GLIBC_2.3.4;