About
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rebuilding sympy.spec is failing running this:
mktexfmt pdflatex.fmt

various *.tex files & language.dat were not found , or not in the texhash DB.

Solution is to copy them from the texlive-extension subdir:
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cp /usr/share/texlive-extension/texmf-dist/tex/generic/hyphen/{hyphen.tex,dumyhyphen.tex,zerohyph.tex} \
 /usr/share/texlive/texmf-dist/tex/generic/hyphen/

cp /etc/texlive/tex/generic/config/language.dat \
 /usr/share/texlive/texmf-dist/tex/generic/config/

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then run:
texhash

now they will be seen with:
kpsewhich hyphen.tex -> /usr/share/texlive/texmf-dist/tex/generic/hyphen/hyphen.tex

Author
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PryMar56
Jun 2022