g77 is configured automatically when you configure
gcc.
There are two parts of g77 that are configured in two
different ways---g77, which "camps on" to the
gcc configuration mechanism, and libf2c, which
uses a variation of the GNU autoconf configuration
system.
Generally, you shouldn't have to be concerned with
either g77 or libf2c configuration, unless
you're configuring g77 as a cross-compiler.
In this case, the libf2c configuration, and possibly the
g77 and gcc configurations as well,
might need special attention.
(This also might be the case if you're porting gcc to
a whole new system--even if it is just a new operating system
on an existing, supported CPU.)
To configure the system, see section `Installing GNU CC' in Using and Porting GNU CC, following the instructions for running `./configure'. Pay special attention to the `--prefix=' option, which you almost certainly will need to specify.
(Note that gcc installation information is provided
as a straight text file in `gcc/INSTALL'.)
The information printed by the invocation of `./configure' should show that the `f' directory (the Fortran language) has been configured. If it does not, there is a problem.
Note: Configuring with the `--srcdir' argument is known
to work with GNU make, but it is not known to work with
other variants of make.
Irix5.2 and SunOS4.1 versions of make definitely
won't work outside the source directory at present.
g77's
portion of the `configure' script issues a warning message
about this when you configure for building binaries outside
the source directory.
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