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-rw-r--r--src/atomic_ops.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/atomic_ops.c b/src/atomic_ops.c
index 5588e95..c46e2d1 100644
--- a/src/atomic_ops.c
+++ b/src/atomic_ops.c
@@ -256,6 +256,6 @@ void AO_store_full_emulation(volatile AO_t *addr, AO_t val)
#else /* Non-posix platform */
-int AO_non_posix_implementation_is_entirely_in_headers;
+extern int AO_non_posix_implementation_is_entirely_in_headers;
#endif