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A general description is here.
‘configure’ works harder to set additional flags in ‘SAFE_FFLAGS’ only where necessary.
In rare circumanstances it may be necessary to override the setting of ‘SAFE_FFLAGS’.
‘R CMD build’ checks for GNU ‘cp’ rather than assuming Linux has it. (PR#17370 says ‘Alpine Linux’ does not.)
‘nls(`NO [mol/l]` ~ f(t))’ and ‘nls(y ~ a)’ now work. (Partly from PR#17367)