1123: <file(module)> : compiled with Clipper 5.0 not Summer '87 
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  This message indicates that Blinker has determined that the specified
  module was compiled with Clipper 5.0, but that the first FILE in the
  application was compiled with Clipper Summer '87. All Clipper compiled
  modules in a single application must be compiled with the same version
  of Clipper.

  Ensure you are linking the correct versions of the Nantucket libraries
  and any third party libraries for the version of Clipper that you are
  using, and also make sure all Clipper compiled .OBJ files were compiled
  with the same version of Clipper.