What does this error message means?

[Alex Buell]

I've been trying to get an old C++ program to compile and one of the error
messages I've seen is the one as below:

../dagCL/AssocArray.h:48: warning: ANSI C++ forbids declaration `dagAssocArray' with no type

What does this means, and is there an option to pass to the compiler to
tell it to pretend it's an old C++ compiler to get around this message? 

Cheers,
Alex
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