TexStudio how to reference custom packages (local texmf tree)?

Question

In my project folder I created the file project/texmf/tex/latex/mymacros.sty. From the command line, I can use export TEXMFHOME=texmf and then everything works fine, pdflatex recognizes all commands defined in mymacros.sty after \usepackage{mymacros}.

How do I have to setup TexStudio so that it recognizes the files located in that folder? I tried to include export TEXMFHOME=texmf in the precompile but it throws an error:

Error: Could not start the command: export TEXMFHOME=texmf

Related:

• How to add new packages to TeXStudio (I don't want to add the packages to my texlive distribution, as they belong locally to the project. (also crucial for making the project easier to export!) I am rather looking to a solution akin to python virtual environments -- Is there a way to create Tex Live or LaTeX virtual environment?)
• Texstudio and local texmf (using makefiles instead -- I am using a makefile to bulk compile, however for here I am looking for a solution using vanilla TexStudio)
• https://github.com/texstudio-org/texstudio/issues/336 (Autocompletion for the .sty files)

Answer 1

With a current texlive 2019 I would suggest to do

tlmgr conf auxtrees add path/to/project/texmf

With a current miktex you can do

initexmf --register-root=path/to/project/texmf