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# We're providing a pre-existing source directory. Make sure we don't trigger
# an error if the undocumented but used-in-the-wild CMAKE_DISABLE_SOURCE_CHANGES
# variable is set.
set(CMAKE_DISABLE_SOURCE_CHANGES TRUE)
include(ExternalProject)
ExternalProject_Add(source_dir_existing
SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/Foo"
DOWNLOAD_COMMAND "${CMAKE_COMMAND}" -E echo "Download command executed"
UPDATE_COMMAND ""
CONFIGURE_COMMAND ""
BUILD_COMMAND ""
TEST_COMMAND ""
INSTALL_COMMAND ""
)