problems when building Breve plugin

Hi,
I wrote an plugin for Breve and am building it, but there is an error during linking.
Because I am using some windows library, my link options are:"-lm -lws2_32, -lstdc++"
And the error message:
"/mingw/lib/libstdc++.a(stl-inst.o)(.text$_ZNSt24_default_alloc_templateILblELiOEE5
_LockC2Ev+0x2b):undefined reference to '_gthr_win32_mutex_lock'......."  
and a bunch of error messages like that.
 
Is this because the libstdc++.a in Mingw have some conflicts with the library I am asking to link?
Does anyone bumps into this problem before?
 
Thanks a lot!
 
Naiqi Weng

		
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