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message("Downloading ${URL}")
file(DOWNLOAD ${URL} ${DST} SHOW_PROGRESS STATUS DOWNLOAD_STATUS)
list(GET DOWNLOAD_STATUS 0 DOWNLOAD_ERR)
list(GET DOWNLOAD_STATUS 1 DOWNLOAD_MSG)
if(DOWNLOAD_ERR)
file(REMOVE ${DST})
message(SEND_ERROR "Download of sample map from ${URL} failed: "
"${DOWNLOAD_MSG}\n"
"To disable the sample map, run cmake with -DSAMPLE_MAP=n .")
endif(DOWNLOAD_ERR)
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