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-rw-r--r--linuxthreads/semaphore.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/linuxthreads/semaphore.c b/linuxthreads/semaphore.c
index 7ca609f6b2..6f79dc0138 100644
--- a/linuxthreads/semaphore.c
+++ b/linuxthreads/semaphore.c
@@ -14,6 +14,7 @@
 
 /* Semaphores a la POSIX 1003.1b */
 
+#include <errno.h>
 #include "pthread.h"
 #include "semaphore.h"
 #include "internals.h"