having major issues with cmake 3.17.3 and msgpack-c

[SkyLeach]

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| ~/src/neovim-cygwin/msgpack-c @ LAPTOP-VMKPGUNA (mattg)
|💀> wcygport --64 msgpack-c.cygport all
>>> Preparing msgpack-c-3.2.0-0.x86_64
>>> Unpacking source msgpack-3.2.0.tar.gz
>>> Preparing working source directory
>>> Compiling msgpack-c-3.2.0-0.x86_64
CMake Error: Could not find CMAKE_ROOT !!!
CMake has most likely not been installed correctly.
Modules directory not found in
/share/cmake-3.17.3
CMake Error: Error executing cmake::LoadCache(). Aborting.

*** ERROR: cmake failed

this appears to be an error with cygwin cmake and how cmake is called. If it is called like cmake then it throws that error. If it is called like /usr/bin/cmake then all is well. Setting CMAKE_ROOT makes no difference afaict.

And there ends my knowledge and time on this, at least for now.