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-rw-r--r--revision.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/revision.h b/revision.h
index f64e8ce7ff..1b045669ae 100644
--- a/revision.h
+++ b/revision.h
@@ -119,7 +119,7 @@ struct rev_info {
void read_revisions_from_stdin(struct rev_info *revs);
typedef void (*show_early_output_fn_t)(struct rev_info *, struct commit_list *);
-volatile show_early_output_fn_t show_early_output;
+extern volatile show_early_output_fn_t show_early_output;
extern void init_revisions(struct rev_info *revs, const char *prefix);
extern int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def);