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-rw-r--r--configure.in3
1 files changed, 2 insertions, 1 deletions
diff --git a/configure.in b/configure.in
index d3199582ab..c01f83d5fb 100644
--- a/configure.in
+++ b/configure.in
@@ -764,7 +764,8 @@ PGAC_UNION_SEMUN
AC_MSG_CHECKING(for fcntl(F_SETLK))
-AC_TRY_LINK([#include <fcntl.h>],
+AC_TRY_LINK([#include <stdio.h>
+#include <fcntl.h>],
[struct flock lck;
lck.l_whence = SEEK_SET; lck.l_start = lck.l_len = 0;
lck.l_type = F_WRLCK;