makeinfo option -D bug not fixed

Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty

texinfo:
  Installed: 5.2.0.dfsg.1-2
  Candidate: 5.2.0.dfsg.1-2
  Version table:
 *** 5.2.0.dfsg.1-2 0
        500 http://ch.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

In the version of texinfofor 14.04, the behaviour of makeinfo -D "variable value" doesn't work.

eg.

$ cat test.texi
@value{var1}

$ makeinfo -D 'var1 foo' -o test.info test.texi
test.texi:1: warning: undefined flag: var1
test.texi: warning: document without nodes
$ cat test.info
This is test.info, produced by makeinfo version 5.2 from test.texi.

{No value for 'var1'}

Tag Table:

End Tag Table

This bug has been fixed in debian,

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=730599

I guess it should be in backports but

sudo apt-get install -t trusty-backports texinfo

doesn't fix it