trying to install ATLAS

[Craig Treleaven]

> On Mar 15, 2018, at 8:29 AM, pagani laurent via macports-users <macports-users at lists.macports.org> wrote:
> 
> I reinstalled gcc5, both gcc5 and 7 are active but the result is the same.
> I desactivate gcc7 but Xcode gcc takes precedence upon Macports/gcc5 even when I deactivate/reactivate the later.
> 

I’m not familiar with ATLAS but I think you need to choose one of the variants in order to build it with another compiler:

$ port variants atlas
atlas has the variants:
   gcc49: build using macports-gcc-4.9
     * conflicts with gcc5 mpclang37 perf
   gcc5: build using macports-gcc-5
     * conflicts with gcc49 mpclang37 perf
   mpclang37: use mp-clang-3.7 and gfortran
     * conflicts with gcc49 gcc5 perf
   nofortran: Forgo use of fortran compiler
   universal: Build for multiple architectures

Perhaps try

sudo port install atlas +gcc5

Also, some packages can take a very long time to build.  Adding the verbose flag can give you more feedback as the build progresses:

sudo port -v install atlas +gcc5

Craig