In building Gnuradio 3.8.1 (i need this version not a higher version) I faced a strange error ....Can anyone guide me? thanks in advance
Scanning dependencies of target doxygen_target
[ 0%] Generating documentation with doxygen
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This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/Debian) (preloaded format=latex)
restricted \write18 enabled.
entering extended mode
(./_formulas.tex
LaTeX2e <2020-02-02> patch level 2
L3 programming layer <2020-02-14>
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Document Class: article 2019/12/20 v1.4l Standard LaTeX document class
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! LaTeX Error: File `newunicodechar.sty' not found.
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