> That is wrong.  It should be without the period, to let web2c splice in
> the defaults at the empty point:

> BIBINPUTS=build:
> TEXINPUTS=build:

> In a shell script, you would splice in any possible previous value, so

> BIBINPUTS="build:$BIBINPUTS"
> TEXINPUTS="build:$TEXINPUTS"


I am not entirely sure I understand. 

I put the lines 
 BIBINPUTS="build:$BIBINPUTS"
 TEXINPUTS="build:$TEXINPUTS"


In my .bashrc and changed to the bash shell

echo "$BIBINPUTS"

Gave 
build:

export -p | grep BIBINPUTS

Gave
nothing


And compiling the way described still gave
--8<---------------cut here---------------start------------->8---

Running `BibTeX' on `test-bib' with ``bibtex build/test-bib.aux''
This is BibTeX, Version 0.99d (TeX Live 2023/Debian)
The top-level auxiliary file: build/test-bib.aux
The style file: biblatex.bst
I couldn't open database file test.bib
---line 6 of file build/test-bib.aux
 : \bibdata{test-bib-blx,test
 :                           }
I'm skipping whatever remains of this command
Database file #1: test-bib-blx.bib
Warning--I didn't find a database entry for 
"nordstrom13:_zur_theor_gravit_stand_relat"
Biblatex version: 3.19
(There was 1 error message)

TeX Output exited abnormally with code 2 at Mon Dec 29 20:45:17
--8<---------------cut here---------------end--------------->8---


So there is something elementary I still don't gasp

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