I see, so you ran into this issue when you try to built ROOT on Ubuntu 16? If so, I wonder if you can disable the built of submodule XrdClHttp (it is a submodule so far), perhaps via this flag to cmake3: -DXRDCLHTTP_SUBMODULE=0 (or not define it at all). The module is used for xrootd to access HTTP data source (including S3). ROOT already knows how to access HTTP and I don't think ROOT currently support accessing S3. -- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1803#issuecomment-1281229092 You are receiving this because you commented. Message ID: <[log in to unmask]> ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1