On some systems, perhaps just those with out-of-date (shared?)
libraries, unresolved-reference errors happen when linking g77-compiled
programs (which should be done using g77).
If this happens to you, try appending `-lc' to the command you
use to link the program, e.g. `g77 foo.f -lc'.
g77 already specifies `-lg2c -lm' when it calls the linker,
but it cannot also specify `-lc' because not all systems have a
file named `libc.a'.
It is unclear at this point whether there are legitimately installed
systems where `-lg2c -lm' is insufficient to resolve code produced
by g77.
If your program doesn't link due to unresolved references to names
like `_main', make sure you're using the g77 command to do the
link, since this command ensures that the necessary libraries are
loaded by specifying `-lg2c -lm' when it invokes the gcc
command to do the actual link.
(Use the `-v' option to discover
more about what actually happens when you use the g77 and gcc
commands.)
Also, try specifying `-lc' as the last item on the g77
command line, in case that helps.
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