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-rw-r--r--src/or/tor_main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/or/tor_main.c b/src/or/tor_main.c
index ac32eef559..21fbe3efb5 100644
--- a/src/or/tor_main.c
+++ b/src/or/tor_main.c
@@ -3,6 +3,8 @@
* Copyright (c) 2007-2016, The Tor Project, Inc. */
/* See LICENSE for licensing information */
+extern const char tor_git_revision[];
+
/** String describing which Tor Git repository version the source was
* built from. This string is generated by a bit of shell kludging in
* src/or/include.am, and is usually right.