legacy code with real*16

[James Mitchell Allmond]

I'd appreciate any help. I'm compiling some old legacy code that  
makes use of real*16 variables in computations. More specifically,  
eigenvector computations from matrix diagonalization of order (3000 x  
3000) in size.  Since gfortran does not seem to support real*16 and I  
want to have this legacy code compatible with standard compilers, is  
there an alternative to real*16 I can use? I'm also wondering if  
real*8 is good enough for matrix diagonalization of this size.  I'm  
currently compiling this on x86 32 bit. I also have at my disposal  
x86 amd 64 bit, and a G4 32 bit. Thanks for any suggestions.


------
James Mitchell Allmond

"I like nonsense, it wakes up the brain cells. Fantasy is a necessary  
ingredient in living, it's a way of looking at life through the wrong  
end of a telescope. Which is what I do, and that enables you to laugh  
at life's realities." Dr. Seuss