на Бубунте 22.04 после
apt install texlive texinfo

makeinfo --pdf c.texi

ругаесся:

Writing index file c.fn

Overfull \hbox (30.46255pt too wide) detected at line 45
@titlerm GNU C Language Intro and Reference Manual |
[1{/var/lib/texmf/fonts/map/pdftex/updmap/pdftex.map}])
Runaway argument?
^^M^^MYou can call @code{main} from C code, as you can call any other@ETC.
! File ended while scanning use of @next.
<inserted text>
                @par
<*> \input ./c.texi
                    \input ./c.texi
?
! Emergency stop.
<inserted text>
                @par
<*> \input ./c.texi
                    \input ./c.texi
!  ==> Fatal error occurred, no output PDF file produced!
Transcript written on c.log.
/usr/bin/texi2dvi: pdfetex exited with bad status, quitting.