Version 2.1 is available upstream. Please consider updating! It seems that version 2.1 is available upstream, while the latest version in the Gentoo tree is 2.1_pre20210326. You think this warning is false? Read more about it here.
Scalpel is a fast file carver that reads a database of header and footer
definitions and extracts matching files or data fragments from a set of image
files or raw device files. Scalpel is filesystem-independent and will carve
files from FATx, NTFS, ext2/3, HFS+, or raw partitions. It is useful for both
digital forensics investigation and file recovery.