He describes its origin in the G95 manual. To aviod this, you can copy the text from this file and append it to your autoexec. Part of the reason for the transition from g77 to gfortran is to make mixing-in with C code simpler, and avoid most of the acts of cruel and unusual programming which were previously required to get the compilers' outputs to co-operate. This should work with any i compatible processor. For various historical reasons, g77 has been declared obsolete, and has been replaced by gfortran. 
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Where has g77 gone to?
Mixing C and Fortran: If in doubt, or if you don't know what cygwin and mingw are, foftran package for you is the "native Windows" package! Detailed instructions are here.
F77 Flags to Fortran compiler: Compler compilation, using gcc at link time: Next, unzip this file onto the root folder of drive C:. If that's fortraan, and said libraries were built using g77 not always the caseyou may need to change certain other gfortran settings.
Both PowerPC and Intel compilers are provided: If in doubt, use the generic version: Inevitably, the results of said acts were almost inevitably fragile and non-portable.
If all else fails: If you've got a literal "g77" string hard-wired compilr more action lines than you've had hot dinners, or it's somebody else's Makefile which you can't tinker with, one quick-and-dirty way around this is to first say:.
From this point on, you are quite definitely into on your own head be it territory. This compilsr from the Free Software Foundation.
It's worth noting that gcc and gfortran share the same back-end software to do most of the compilation process, and that the manual page for gfortran contains only those options which it doesn't share with gcc. If you've got a literal tortran string hard-wired into more action lines than you've had hot dinners, or it's somebody else's Makefile which you can't tinker with, one quick-and-dirty way around this is to first say: The equivalent change in a Makefile would be From: If for some reason your program really does need to be bit, the next thing to try would be: The relevant variables in Makefiles include: For various historical reasons, g77 has been declared obsolete, and fkrtran been replaced by gfortran.
There is also a related run-time library problem: You may be pleasantly surprised. You may however need to add or change some compilation arguments, and possibly one or two of the link-time libraries.
If you've got a Makefile full of hard-coded g77 statements, please see the aside on Activate fake-g77 for a quick-and-dirty way to deal with that. This should work with any i compatible processor.
Compiling g77 program with gfortran
Instructions are on this page. We're willing to put in the effort, and to then document the offending practices, together with our suggested replacements, for others to benefit from. Under Snow Leopard and later, this will produce a bit executable. Some suites mix sourcecode in Fortran and C. They probably work for versions above If the above bit compilation succeeds for you, but the executable complains about missing system-type libraries, try installing g77 from Self-Service, then rerunning said executable without recompiling it.
To aviod this, you can copy the text from this file and append it to your autoexec.
They provide three compilers, one running on Windows it works on both bit and bit Windowsone on bit Cygwin and one on bit Linux. The proper fix is to find versions of the offending libraries which have been, compkler can be, compiled using gfortran with the default settings including bit object code. If you compile with the Fortran compiler, use the same Fortran compiler to do the linking:
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