New in version 3.30.

This is a CMake Environment Variable. Its initial value is taken from the calling process environment.

Specify the default value for the file(DOWNLOAD) and file(UPLOAD) commands' TLS_VERIFY option. This environment variable is used if the option is not given and the CMAKE_TLS_VERIFY cmake variable is not set.

This variable is also used by the ExternalProject and FetchContent modules for internal calls to file(DOWNLOAD) and git clone.