extern

HI,
     I'm using -  msp430-gcc (GCC) 4.6.3 20120301 (mspgcc LTS 20120406 
unpatched)- and it fails on

extern unsigned short int ContactThreshold;

giving this error

msp430-gcc -Os -Wall -g -mmcu=msp430f5438a main.cpp
/tmp/cciyW9nS.o: In function `SetSensitivity(unsigned short)':
/home/stan/msp430/Ovi_Stuff/main.cpp:258: undefined reference to 
`ContactThreshold'

If I junk extern it compiles and once I get there I expect a linker 
error with ContactThreshold defined in two places.

Any suggestions appreciated.  Ian.  Oh and it did compile with windows.  
Maybe I should change to straight c in place of cpp.

         Regards Ian.

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