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Message: [QUOTE="Alan Balmer, post: 1698120"] Since it's declared static, it doesn't need to have extern linkage, and in fact, the uses in the two files may conflict. Apparently there's some concern that this variable have the same initial value in both of the programs where it's used, so I would do something like #define MY_SPECIAL_VALUE 3 in the header file, then each file that needs it declares static int my_const_var = MY_SPECIAL_VALUE; (Actually, I'm suspicious that this program doesn't even need a variable, but can't tell without seeing the rest of it.) [/QUOTE]