The tag is present in Lintian version 2.104.328. That is the most recent version we know about.
The listed ELF binary appears to use the C library function
fcrypt, which is a less-portable alias for
Programs that use this function cannot be linked against the
libcrypt.so provided by glibc 2.28 and higher.
The program should be changed to use
A false positive for this check is possible if the binary expects
the definition of
fcrypt to come from some shared library
libcrypt.so, and that shared library
defines this function to do something other than hash passphrases.
If this is the case it is appropriate to override this tag.