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answered 7 years ago
There are some suggestions in this question.
However, the easiest thing to do might be to create a sagerc file per this page (I guess the default location is ~/.sage/sagerc) containing: export PATH = "$PATH:/Library/TeX/texbin/pdflatex"
~/.sage/sagerc
export PATH = "$PATH:/Library/TeX/texbin/pdflatex"