1 files changed, 4 insertions, 0 deletions
diff --git a/job.h b/job.h
index 4745127..c9902f0 100644
--- a/job.h
+++ b/job.h
@@ -78,6 +78,10 @@ typedef int sync_handle_t;      /* file descriptor */
 #  define RECORD_SYNC_MUTEX(m) (void)(m)
 
 # endif
+#else /* !OUTPUT_SYNC */
+#define RECORD_SYNC_MUTEX(m) \
+   error (NILF, \
+         _("-O[TYPE] (--output-sync[=TYPE]) is not configured for this build."));
 #endif  /* OUTPUT_SYNC */
 
 /* Structure describing a running or dead child process.  */