Hi,
libgfortran would be used by the statistical model. If your output files like SE.MATS.JC.txt have values for the PValue and FDR columns then it should be fine to ignore that error
I just tried installing rmats with:
conda install -c conda-forge -c bioconda rmats=4.2.0
And in the lib/ directory of the conda environment there was libgfortran.so.5. I was able to run rmats using that conda environment and get PValue and FDR results. I'm not sure if you can install
libgfortran.so.1
from conda, but installing rmats to a new conda environment with the command above should work
Eric