Try to fix Debian riscv64 build
checking for XROOTD headers... -I/usr/include/xrootd checking for _init in -lXrdPosix... no
See build logs at: https://buildd.debian.org/status/logs.php?pkg=nordugrid-arc&arch=riscv64
6.9.0-1 and -2 do not have this proposed change applied and the builds failed. 6.9.0-3 has this proposed change applied and build succeeded. Earlier builds did not try to build the xrootd plugin, since xrootd was not in Debian until recently.
Edited by Mattias Ellert