This package will take a long time to build, although don't be surprised if it fails on the first try.  I can never get it to work on the first try with default settings.
On 3/15/18 9:45 AM, Craig Treleaven wrote:
On Mar 15, 2018, at 8:29 AM, pagani laurent via macports-users 
<macports-users@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


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