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Brad King authored
In commit v3.0.0-rc1~103^2~3 (ExternalProject: Reattempt download when verification fails, 2014-01-15) a reference to ${CMAKE_COMMAND} was added to generate a reference to the CMake command in a cmake script. Escape the '$' so that the literal variable reference appears in the script instead of writing the path to the current cmake. This is necessary when the path to CMake contains spaces or other characters special to CMake syntax.
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