how can i declare bit flag in header file ?

hello,

i want to declare a bit flag in the header file which i have used in several C files.
for ex: i have declared a flags like......

bit isr_set=0;
bit buferflg=0;

These flags are used in 2-3 more C files.for that i am getting a eroor message

*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS SYMBOL: BUFERFLG MODULE: XXXXXXXXXXXXXXXXXXXXX

can u please tell me how can i declare these type of multiple declarations.

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