Rtools28 - undefined references with gfortran

I recently upgraded to Rtools28 to build a package under
Windows.  I see that g77 is no longer in Rtools, but it
does have gfortran, and it uses version:
  GNU Fortran (GCC) 4.2.1-sjlj (mingw32-2)

I am compiling some old fortran code as part of a larger
project.  When I do that, I get undefined references:

gcc.exe: s_cmp.o: No such file or directory
gcc.exe: s_copy.o: No such file or directory
gcc.exe: s_cat.o: No such file or directory
gcc.exe: F77_aloc.o: No such file or directory

I don't see these entry points in any of the accompanying
library files.   I hunted around and found the above
functions in an old MinGW library libg2c.lib
libg2c.a, perhaps?
When I link them in, I get different undefined references:

ilaenv.o:ilaenv.f:(.text+0x55): undefined reference to
`_gfortran_compare_string
dlamch.o:dlamch.f:(.text+0x3bf): undefined reference to
`_gfortran_pow_r8_i4'
dormlq.o:dormlq.f:(.text+0x281): undefined reference to
`_gfortran_concat_string

Any guidance on how to solve this problem?
Give a reproducible example (or at least all the steps you used) : see the 
posting guide.

At a guess you are using gcc.exe to link Fortran code, not gfortran.exe. 
You can sometimes do that by adding -lgfortran to the link line.  But 
don't expect your helpers to be prepared to guess ....
John Nolan
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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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