1 files changed, 1 insertions, 1 deletions
diff --git a/auto.def b/auto.def
index a6b7bdd..ec202a2 100644
--- a/auto.def
+++ b/auto.def
@@ -101,7 +101,7 @@ cc-check-functions ualarm lstat fork vfork system select execvpe
 cc-check-functions backtrace geteuid mkstemp realpath strptime isatty
 cc-check-functions regcomp waitpid sigaction sys_signame sys_siglist isascii
 cc-check-functions syslog opendir readlink sleep usleep pipe getaddrinfo utimes
-cc-check-functions shutdown socketpair isinf isnan link symlink
+cc-check-functions shutdown socketpair isinf isnan link symlink fsync
 
 if {[cc-check-functions sysinfo]} {
     cc-with {-includes sys/sysinfo.h} {