[Octave-bug-tracker] [bug #55916] pdfTeX warnings in build: found PDF version <1.7>, but at most version <1.5> allowed

[Rik]

Follow-up Comment #1, bug #55916 (project octave):

This is odd.  It seems like there is a possible mismatch between the TexInfo
tools on your computer and the PDF files generated by gl2ps and ghostscript.

Taking the first example form your logfile: splinefit6.pdf.

This is created by Octave itself by the code in
doc/interpreter/splineimages.m.  If I run pdfinf on the file on my Linux
machine I get:


pdfinfo splinefit6.pdf 

Title:          gl2ps_renderer figure
Author:         Octave
Creator:        GL2PS 1.4.0, (C) 1999-2017 C. Geuzaine
Producer:       GPL Ghostscript 9.26
CreationDate:   Sun Mar  3 20:47:27 2019 PST
ModDate:        Sun Mar  3 20:47:27 2019 PST
Tagged:         no
UserProperties: no
Suspects:       no
Form:           none
JavaScript:     no
Pages:          1
Encrypted:      no
Page size:      360 x 252 pts
Page rot:       0
File size:      25697 bytes
Optimized:      no
PDF version:    1.7


So, it is true that the PDF version is 1.7.

The inclusion into the output is in poly.txi


@float Figure,fig:splinefit6
@center @image{splinefit6,4in}
@caption{Comparison of two different levels of robust fitting (@var{beta} =
0.25 and 0.75) to noisy data combined with outlying data.  A conventional fit,
without
robust fitting (@var{beta} = 0) is also included.}
@end float


The .txi is munged to form a .texi file (Texinfo format) and later made a pdf
file with pdfetex.  Versions on my computer are


texinfo         6.5.0.dfsg.1
texlive-binaries 2017.2017061  (for pdfetex)


Maybe your texlive installation is too old?


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