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-rw-r--r--src/include/c.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/c.h b/src/include/c.h
index 2cc2784750e..d35405f191a 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -1290,7 +1290,7 @@ typedef union PGAlignedXLogBlock
* standard C library.
*/
-#if defined(HAVE_FDATASYNC) && !HAVE_DECL_FDATASYNC
+#if !HAVE_DECL_FDATASYNC
extern int fdatasync(int fildes);
#endif