conundrum: _C99_SOURCE vs. sigset

[Mikhail Teterin]

Hello!

I'm trying to compile a program, which uses threads and has its own daemon 
global variable.

The variable's declaration results in an error:

recsnap.C:50: error: `RTRString daemon' redeclared as different kind of symbol
/usr/include/stdlib.h:252: error: previous declaration of `int daemon(int, 
int)'

The daemon()'s declaration in stdlib.h can be turned off by declaring either 
_C99_SOURCE or _ANSI_SOURCE. Unfortunately, both of these defines also turn 
off the declaration of sigset_t and fd_set:

/usr/include/pthread.h:233: error: expected `,' or `...' before '*' token
.../include/rtr/selectni.h:129: error: `fd_set' does not name a type

Can this be solved -- without modifying the vendor's code? Thanks!

	-mi