Location of declarations in Linux vs FreeBSD, etc.

[Philip Kovacs]

Hi,

Can anyone tell me how best to approach the problem of variation
of location of function declarations across OS'es?

For example, in Linux the declaration for daemon() is in <unistd.h>,
but in FreeBSD it is in <stdlib.h>. In both cases, AC_CHECK_FUNCS([daemon]) 
has no problem finding daemon(), but I am interested defining a variable
so that the program can include (only) the correct header.

Is it possible to identify which header a function is located in, e.g.
given a list of possible headers?  Whats's the "right" way to handle this?

Thanks.

Phil

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