Update installation instruction for mac

[KaiSzuttor]

as reported by C. Holm

[fweik]

@mkuron can you maybe have a look at the command change, I don't understand that ports stuff...

[codecov]

Codecov Report

Merging #3732 into python will decrease coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           python   #3732   +/-   ##
======================================
- Coverage      89%     89%   -1%     
======================================
  Files         548     548           
  Lines       24455   24431   -24     
======================================
- Hits        21779   21756   -23     
+ Misses       2676    2675    -1     

Impacted Files	Coverage Δ
src/core/thermostat.hpp	89% <0%> (-2%)	⬇️
src/core/integrators/brownian_inline.hpp	90% <0%> (-1%)	⬇️
src/core/particle_data.cpp	96% <0%> (-1%)	⬇️
src/core/constraints/ShapeBasedConstraint.cpp	88% <0%> (-1%)	⬇️
src/core/forces_inline.hpp	90% <0%> (-1%)	⬇️
src/core/forces.cpp	100% <0%> (ø)
src/core/Particle.hpp	100% <0%> (ø)
src/core/integrators/langevin_inline.hpp	100% <0%> (ø)
src/core/unit_tests/thermostats_test.cpp	100% <0%> (ø)
src/core/constraints/HomogeneousMagneticField.cpp	100% <0%> (ø)
... and 1 more

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[mkuron]

Cannot confirm this. The documentation was correct as-is. Maybe he needs to update his MacPorts. I believe that was changed a few months ago.

$ port installed openmpi*
  openmpi-default @4.0.1_1 (active)
$ port select --list mpi
Available versions for mpi:
	none
	openmpi-mp (active)

[KaiSzuttor]

Even if the documentation is correct in some cases, it obviously does not cover all macport environments.

[fweik]

I'd rather have it not reference fortran if not needed...

[mkuron]

Okay, he is right. I seem to have had an OpenMPI package without Fortran bindings.

$ port install openmpi-default +gcc10
$ port select --list mpi
Available versions for mpi:
	none
	openmpi-mp-fortran (active)

The +gcc10 variant is the default, so Fortran bindings will be installed by default.

[fweik]

So the updated version is correct, yes?