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The configure script produces a Makefile.
It is controlled by environment variables (see below).
It tries to use reasonable default values if they are not set (properly).
In the script the machine type is determined with `uname -m`.
According to the control variables and the machine architecture
the compiler name and its compiler flags are composed.
These are written into the header of a Makefile which is produced in the end.
An existing Makefile is appended to
4.3 Configure script
Additionally, the compilation command is written into the file
in a form ready to be included in a Fortran program.