-extern int parseopt_column_callback(const struct option *, const char *, int);
-extern int git_column_config(const char *var, const char *value,
- const char *command, unsigned int *colopts);
-extern int finalize_colopts(unsigned int *colopts, int stdout_is_tty);
+int parseopt_column_callback(const struct option *, const char *, int);
+int git_column_config(const char *var, const char *value,
+ const char *command, unsigned int *colopts);
+int finalize_colopts(unsigned int *colopts, int stdout_is_tty);