Trying to compile: Compilation error: 'ETH_CLK_MODE' was not declared in this scope

[rlh100]

I am trying to compile this code and the build fails with:

  /home/science/harker/Sound/Timecode/Projects/gps-ntp-eth-esp32/gps-ntp-eth-esp32.ino: In function 'void setup()':
  /home/science/harker/Sound/Timecode/Projects/gps-ntp-eth-esp32/gps-ntp-eth-esp32.ino:186:77: error: 'ETH_CLK_MODE' was not declared in this scope
  186 |     ETH.begin(ETH_ADDR, ETH_POWER_PIN, ETH_MDC_PIN, ETH_MDIO_PIN, ETH_TYPE, ETH_CLK_MODE); // Enable ETH
  exit status 1
  Compilation error: 'ETH_CLK_MODE' was not declared in this scope

I have a fresh install of Arduino IDE 2.3.4.
I have set the board to be LilyGo T-Display
I have installed the Arduino ESP32 Boards 2.0.18 library
I have installed the TFT_eSPI 2.5.43 library

I think I am missing some more libraries like a WiFi library. What libraries are need to support:

  #include @Wire.h@ 
  #include @time.h@ 
  #include @string.h@ 
  /// ESP-related stuff. You can get these via the board manager 
  #include @WiFi.h@ 
  #include @WiFiClient.h@ 
  #include @WiFiUdp.h@ 
  #include @Ticker.h@ 

Note: the @ are angle brackets that github eats as invalid HTML. Yes, I did try backslashes before the angle brackets.

Please include actual library names I can find in the library manager.

I realize this is probably a newbie problem, but then again, I am a newbie programmer.
I do realize I will need to change some parameters in the code like pin numbers and screen size. These should be straight forward once I get the code to compile.

Thank you,
RLH