cmake DAKOTA_HAVE_GSL examples

snl-dakota/dakota cmake/DakotaOptions.cmake :160 

option(DAKOTA_HAVE_GSL "Toggle GSL support, default is disabled" OFF)

snl-dakota/dakota packages/CMakeLists.txt :55 

message(FATAL_ERROR 
      "HAVE_QUESO requires enabling GPL package GSL via DAKOTA_HAVE_GSL.")

snl-dakota/dakota src/CMakeLists.txt :891 

endif(DAKOTA_HAVE_GSL)