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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