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-rw-r--r--linuxthreads/semaphore.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/linuxthreads/semaphore.h b/linuxthreads/semaphore.h
index 0740962902..fe2b451e07 100644
--- a/linuxthreads/semaphore.h
+++ b/linuxthreads/semaphore.h
@@ -16,6 +16,7 @@
 #define _SEMAPHORE_H    1
 
 #include <features.h>
+#include <sys/types.h>
 
 #include <limits.h>