Hi all, I am trying to build Ceph binaries from the main branch. Sometimes "ninja -j 7 " (see the bottom for steps I run to initiate the build) gets stuck at the step where the Boost library is downloaded. The step description printed on stdout is "Performing download step (download, verify and extract) for 'Boost'". Running nethogs shows that cmake is indeed downloading but the download speed is less than 50 Kbps. Last night, I also saw this issue while building binaries for the "quincy" branch. Cancelling and reinitiating the build has no effect on the download speed. Is there a way to choose the faster/fastest mirror to download the Boost library? How can I change the default mirror that cmake uses? Another option is to use the boost library installed on my system. For this I can pass "-DWITH_SYSTEM_BOOST=ON" to the "do_cmake.sh" script. My system has version 1.76 installed. Will this version work fine? Has anyone tried this before? I don't face this issue all the time. It happens once in a couple months but whenever it does, I am stuck for several hours. System I am using is Fedora 36. Following are the commands I usually run to initiate building of Ceph binaries - $ sudo ./install-deps.sh $ ./do_cmake.sh -DWITH_CEPHFS_SHELL=ON -DWITH_BABELTRACE=OFF -DWITH_MANPAGE=OFF -DWITH_RBD=OFF -DWITH_RADOSGW=OFF -DWITH_KRBD=OFF -DWITH_MGR_DASHBOARD_FRONTEND=OFF $ cd build $ ninja -j 7 Thanks, - Rishabh