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(g77-295.info)Cannot Link Fortran Programs

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Cannot Link Fortran Programs
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   On some systems, perhaps just those with out-of-date (shared?)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.