C99 and localtime_r

[Jim Marshall <jim dot marshall at wbemsolutions dot com>]

Hello,
If this is the wrong mailing list, please direct me to the correct one, 
thanks.
I am having a terrible time with something. I have a need to utilize the 
wprintf series of functions (wide character). I was told in an earlier 
request that i had to use the "-std=c99" switch in order for these 
functions to be available. However; I am now running into problems with 
the "localtime_r" function. If I define the C99 switch I get warnings on 
the localtime_r function (not being defined). I've tried adding various 
-d symbols (-D__USE_POSIX etc...). Nothing works. In fact some of the 
code we have written utilizes the 'timezone' variable defined by libc 
(set by tzset), and with C99 defined that variable is not available 
(without explicitly declaring it as extern by us).
Ideally we need to utilize the wprintf functions and the localtime_r 
function without getting any warnings. is this possible?
I can provide a simple test case if you need.

Thank you
-Jim