I'm attempting to build boost 1.45 for iOS. I have it configured with link=static.  I'm running into a problem with parsers.cpp in program_options due to the following line:

#if defined(__APPLE__) && defined(__DYNAMIC__)
#include <crt_externs.h>
#define environ (*_NSGetEnviron()) 

crt_externs.h does not exist in the iOS sdk. I THINK I can switch of the __DYNAMIC__ macro by passing in -static.  Is there an entry I can put into user-config.jam that instructs bjam to pass in an extra flag when compiling parsers.cpp?  I've been going through the documentation, but I'm not exactly sure what I'm looking for. I'd appreciate some guidance.