1 files changed, 1 insertions, 0 deletions

diff --git a/sem.c b/sem.c
index 4930e4d..efc1b30 100644
--- a/sem.c
+++ b/sem.c
@@ -6,6 +6,7 @@
 #include <string.h>
 #include <semaphore.h>
 #include <time.h>
+#include <fcntl.h>
 
 #define TEST(r, f, x, m) ( \
 ((r) = (f)) == (x) || \