ubuntu 18.04 make documentation inconsistency

ubuntu 18.04 amd

make --version
says 4.1.9

info make
indicates 4.2.1

existing version does not seem to support use of variable .RECIPEPREFIX
so that you can replace tabs with other characters.

/elfhgg

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: make 4.1-9.1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
Uname: Linux 4.15.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Dec 3 18:05:57 2018
Dependencies:
 gcc-8-base 8.2.0-1ubuntu2~18.04
 libc6 2.27-3ubuntu1
 libgcc1 1:8.2.0-1ubuntu2~18.04
InstallationDate: Installed on 2018-04-27 (220 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: make-dfsg
UpgradeStatus: No upgrade log present (probably fresh install)