How to fix download error?

Unsupported protocol

Most sources downloaded by HTTPS protocol so CMake should be build with CURL with enabled OpenSSL. Without HTTPS support you will see this error:

error: downloading
'https://...' failed

  status_code: 1
  status_string: "Unsupported protocol"
  log: Protocol "https" not supported or disabled in libcurl

Closing connection -1

You can check that everything is fine by invoking this script:

# script.cmake

cmake_minimum_required(VERSION 3.2)

file(
    DOWNLOAD
    "https://github.com/ruslo/hunter/archive/v0.23.13.tar.gz"
    "${CMAKE_CURRENT_LIST_DIR}/hunter-archive.tar.gz"
    EXPECTED_HASH SHA1=ef7d6ac5a4ba88307b2bea3e6ed7206c69f542e8
    SHOW_PROGRESS
    TLS_VERIFY ON
)
> cmake -P script.cmake

TLS issues

TODO

Real fix instructions here

If you have any problems with TLS verification you can suppress TLS checks by setting HUNTER_TLS_VERIFY to OFF.