I got this job from successful build https://travis-ci.org/ctlab/phantasus/jobs/452899717
And this job from failed build https://travis-ci.org/ctlab/phantasus/jobs/454405098
They are building the same commit, so i assume that the problem is not in the repo.
The reason of failing build is
/usr/bin/ld: cannot find -lgfortran
gfortran used to be installing by default and now it disappeared.
Not sure if it a bug. Should i add gfortran to travis configuration explicitly now?
cc @jeroen and @jimhester