Cannot compile XMP Toolkit CC201607 for macOS

I'm porting a Windows plugin that uses Adobe XMP Tookit to Mac for AI 25 under Catalina. I have Xcode 10 under Big Sur.

Running GenerateXMPToolkitSDK_mac.sh I end up at these errors, and cannot create the Xcode project for it.

CMake Error at shared/SharedConfig_Mac.cmake:19 (if):

  if given arguments:

    "LESS" "4.3.0"

  Unknown arguments specified

Call Stack (most recent call first):

  shared/SharedConfig.cmake:32 (include)

  XMP_ConfigCommon.cmake:29 (include)

  XMP_Config.cmake:32 (include)

  CMakeLists.txt:68 (include)

 

-- Configuring incomplete, errors occurred!

See also "/Users/rick/Development stuff/XMP-Toolkit-SDK-CC201607/build/xcode/static/intel_64/CMakeFiles/CMakeOutput.log".

 CmakeUtils.txt Failed.

cmake.command failed

ERROR: CMAKE tool failed

I reinstalled cmake using homebrew, which got me past other cmake errors. Any suggestions would be much appreciated!