Protocol "https" not supported or disabled in libcurl
I'm running into this problem on a somewhat dated Fedora 21 system when the build gets to vxl:
[ 29%] Performing download step (download, verify and extract) for 'vxl' -- downloading... src='https://github.com/judajake/vxl/archive/44433e4bd8ca3eabe4e5441444bf2a050d689d45.tar.gz' dst='/scratch/cmb-tpl/downloads/44433e4bd8ca3eabe4e5441444bf2a050d689d45.tar.gz' timeout='none' CMake Error at vxl-stamp/download-vxl.cmake:27 (message): error: downloading 'https://github.com/judajake/vxl/archive/44433e4bd8ca3eabe4e5441444bf2a050d689d45.tar.gz' failed status_code: 1 status_string: "Unsupported protocol" log: Protocol "https" not supported or disabled in libcurl Closing connection -1
/usr/bin/curl itself has no problems with https, so I'm puzzled as to what is going on here. Suggestions?