/usr/lib/gcc/x86_64-w64-mingw32/7.3-win32/libgfortran.spec is in gfortran-mingw-w64-x86-64 7.3.0-11ubuntu1+20.2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This spec file is read by gfortran when linking.
# It is used to specify the libraries we need to link in, in the right
# order.
#
%rename lib liborig
*lib: %{static-libgfortran:--as-needed} -lquadmath %{static-libgfortran:--no-as-needed} -lm %(libgcc) %(liborig)
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