cross compiling for mingw fails in cpack as it cant find the Wix files.

When attempting to build cmake on a Linux machine for mingw (cross compiling):

CMake Error at Source/CMakeLists.txt:989 (add_library):
  Cannot find source file:

    CPack/Wix/cmCMakeToWixPath.cxx

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm .hpp .hxx .in .txx


CMake Error at Source/CMakeLists.txt:989 (add_library):
  No SOURCES given to target: CPackLib

The issue at a quick look is that the sources are in CPack/WiX/, but CMakeFileList.txt is looking for CPack/Wix/

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