libnfsidmap-dev 1:2.6.1-1ubuntu1.2 (arm64 binary) in ubuntu jammy

 Contains the header files and documentation for libnfsidmap
 for use in developing applications that use the libnfsidmap library.
 .
 libnfsidmap provides functions to map between NFSv4 names (which are
 of the form user@domain) and local uid's and gid's.