Below is the warning when configuring brlcad with prefix=/usr. Do not update this spell to use that prefix. It will break your system badly since it uses library names from glibc. }}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} WARNING: It is STRONGLY recommended that you DO NOT install BRL-CAD into /usr WARNING: as BRL-CAD provides several libraries that may conflict with other WARNING: libraries (e.g. librt, libbu, libbn) on certain system configurations. WARNING: WARNING: Since our libraries predate all those that we're known to conflict with WARNING: and are at the very core of our geometry services and project heritage, WARNING: we have no plans to change the names of our libraries at this time. WARNING: WARNING: If you choose to continue installing into /usr, you do so entirely at WARNING: your own risk. You have been warned. Consider using a different --prefix value.