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-rw-r--r--src/common/compat.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/common/compat.c b/src/common/compat.c
index 24b44fb055..69eb0643d0 100644
--- a/src/common/compat.c
+++ b/src/common/compat.c
@@ -870,6 +870,9 @@ tor_lockfile_unlock(tor_lockfile_t *lockfile)
/** @{ */
/** Some old versions of Unix didn't define constants for these values,
* and instead expect you to say 0, 1, or 2. */
+#ifndef SEEK_SET
+#define SEEK_SET 0
+#endif
#ifndef SEEK_CUR
#define SEEK_CUR 1
#endif