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execute_process(COMMAND "${GIT}" describe --dirty --match "v${VERSION}" RESULT_VARIABLE RET OUTPUT_VARIABLE DESCRIPTION OUTPUT_STRIP_TRAILING_WHITESPACE)
if(RET)
message(WARNING "Cannot determine current revision. Make sure that you are building either from a Git working tree or from a source archive.")
set(VERSION "${COMMIT}")
configure_file("src/version.h.in" "${TO}")
else()
string(REGEX MATCH "([0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f])?(-dirty)? $" COMMIT "${DESCRIPTION} ")
string(STRIP "${COMMIT}" COMMIT)
set(VERSION "${COMMIT}")
configure_file("src/version.h.in" "${TO}")
endif()
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