how to refer to the package file in external projects?

Usage
1

how to i refer to the downloaded package with ExternalProject? It is not in <SOURCE_DIR> nor <BINARY_DIR>:

ExternalProject_Add(ext
	URL         ${url}
	DOWNLOAD_NO_EXTRACT    TRUE
	CONFIGURE_COMMAND      "... ?"
)

i ended up using <BINARY_DIR>/../my.pkg

2

There is the <DOWNLOADED_FILE> replacement available for DOWNLOAD_NO_EXTRACT 1 projects.