try to use fabs instead of abs to see if flatpack cares #3638
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For some reason builds on flatpack aren't working, this is a test if using fabs instead of abs is the issue.
To elaborate on this issue: abs(double) is not in c++11, it was added in c++17 and this is why we can still compile it.
Now fabs(double) is the exact same operation and available from c++11 onwards.