when i run ./mkpdf.sh in libjit-master/doc,i got this issue down below,how can i fix?

[sagaciousGenius]

root@VM-0-12-debian:~/downloads/libjit-master/doc# ./mkpdf.sh
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2019/dev/Debian) (preloaded format=pdfetex)
restricted \write18 enabled.
entering extended mode
(./libjit.texi (/usr/share/texmf/tex/texinfo/texinfo.tex
Loading texinfo [version 2018-01-09.11]: pdf, fonts, markup, glyphs,
page headings, tables, conditionals, indexing, sectioning, toc, environments,
defuns, macros, cross references, insertions, localization, formatting,
and turning on texinfo input format.) [1{/var/lib/texmf/fonts/map/pdftex/updmap
/pdftex.map}]
Writing index file libjit.cp
Chapter 1 (/root/downloads/libjit-master/doc/libjit.aux) [1] Chapter 2
Chapter 3 [2] [3] l.309: Undefined cross reference Types-snt'. l.309: Undefined cross reference Types-snt'.
l.309: Undefined cross reference Types-pg'. l.349: Undefined cross reference Instructions-snt'.
l.349: Undefined cross reference Instructions-snt'. l.349: Undefined cross reference Instructions-pg'. [4] [5] [6] [7] [8]
[9] l.773: Undefined cross reference C++ Interface-snt'. l.773: Undefined cross reference C++ Interface-snt'.
l.773: Undefined cross reference C++ Interface-pg'. Overfull \hbox (14.94176pt too wide) in paragraph at lines 800--800 []@texttt jit_insn_call(function, "gcd", function, 0, temp_args, 2, JIT_CALL_T AIL);[] | [10] [11] [12] Chapter 4 ./libjit.texi:980: I can't find file libjitext-init.texi'.
@temp ->@input libjitext-init.texi

@includezzz ...and @input #1 }@expandafter }@temp
@popthisfilestack
l.980 @include libjitext-init.texi

(Press Enter to retry, or Control-D to exit)
Please type another input file name:

[M4GNV5]

You need to compile the software first in order for doc creation to be successful:

./bootstrap
./configure
make

cd doc
./mkpdf.sh