Okay, here's what I did:
1) installed the .dmg file
2) I unpacked the .tar.gz 9.2.0 version and installed it in /usr/local/bin 
using the deal.II app terminal

Now, *from within the deal.II app* terminal, I can compile step-40 and all 
the others that are located at 

/Applications/deal.II.app/Contents/Resources/examples


But if I try to compile step-40 (always within the deal.II app terminal) 
located at 

/Desktop/dealii-9.2.0/examples/ (i.e. the source directory, not in the 
folder above)

I got this error:

*     However, the deal.II library found at /usr/local/bin/deal_9.2.0 was 
configured with these options*

*      DEAL_II_WITH_PETSC = OFF*

*      DEAL_II_PETSC_WITH_COMPLEX = *

*      DEAL_II_WITH_P4EST = OFF*

*      DEAL_II_WITH_TRILINOS = OFF*

*  which conflict with the requirements.*

The problem is that it's not using the "setup 
/Applications/deal.II.app/Contents/Resources/Libraries", but this is 
happening *for step-40 only!* Indeed, if I try to compile step-50( 
17,56,...) it compiles, since it's using the correct setup. 

How is this possible?



Thanks for your patience.
Best, Lukas

Il giorno mercoledì 17 marzo 2021 alle 11:41:09 UTC+1 luca....@gmail.com ha 
scritto:

> If you install the dmg package, and compile the library just like you did 
> before *within the terminal that opens when you click on the deal.II app*, 
> the compilation process would find correctly all the installed libraries.
>
> Best,
> Luca. 
>
> > On 17 Mar 2021, at 10:08, bob bill <vef...@gmail.com> wrote:
> > 
> > Thanks for your answer. 
> > 
> > > My personal option is to install the dmg, then recompile the library 
> (to have the master version).
> > 
> > So I have to install the dmg, even if I still have the library installed 
> from GitHub with the command line procedure ? 
> > 
> > If so, once I installed the dmg successfully , how can I "recompile the 
> library"? 
> > 
> > 
> > Best,
> > Lukas
> > 
> > Il giorno mercoledì 17 marzo 2021 alle 07:57:14 UTC+1 luca....@gmail.com 
> ha scritto:
> > 
> > 
> >> Il giorno 16 mar 2021, alle ore 23:56, bob bill <vef...@gmail.com> ha 
> scritto:
> >> 
> >> 1) If I install dealii by using the prepackaged .dmg file, will I have 
> all the libraries to compile and run step-40?
> >> 
> > 
> > Yes. 
> > 
> >> 2) Is there a way to install dealii and have all those libraries? I've 
> seen the MacOS instructions, but I can't find a workaround for my problem. 
> Should I install PETSc (and the others) manually on my laptop? 
> >> 
> >> 
> > The dmg contains all of the supported external libraries. My personal 
> option is to install the dmg, then recompile the library (to have the 
> master version).
> > 
> > Best, 
> > Luca. 
> > 
> > 
> > 
> > -- 
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>
>

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