gmtime_r undefined reference

[lmfitzgerald@west.raytheon.com]

     Hi,
     
     I'm using gmtime_r in my Unix code (and it works fine) but when I try 
     to compile with Cygwin32 Beta 19.1 it says: undefined reference to 
     gmtime_r.  I'm also getting : undefined reference to _chkstk.
     
     Any ideas on how to fix this?
     
     Help is greatly appreciated.
     
     Lynette
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