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I’ve just installed freefem++ under Fedora 36 using dnf, petsc dynamic lib (.so) are not installed in /usr/lib/64/f++/…

Best regards

You should compile from sources if you want this.

I’m talking about used by load “PETSc”
So the official linux package doesn’t contain the petsc module ?
But the windows binaries contain PETSc.dll.

Which “official” linux package? The only “official” packages are from Releases · FreeFem/FreeFem-sources · GitHub, and there is no such package for Fedora.
It’s not the official repo.

Either ask the maintainers there to ship PETSc with the package, or build FreeFEM yourself with PETSc.