libc {
  GLIBC_2.0 {
    # c*
    cfgetispeed; cfgetospeed; cfmakeraw; cfsetispeed; cfsetospeed; cfsetspeed;

    # i*
    isatty;

    # t*
    tcdrain; tcflow; tcflush; tcgetattr; tcgetpgrp; tcsendbreak; tcsetattr;
    tcsetpgrp;
  }
  GLIBC_2.1 {
    # t*
    tcgetsid;
  }
  GLIBC_2.42 {
    # cf*baud
    cfgetibaud; cfgetobaud; cfsetibaud; cfsetobaud; cfsetbaud;
  }
}