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-rw-r--r--libpthread/linuxthreads/mutex.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/mutex.c b/libpthread/linuxthreads/mutex.c
index 2217a504e..4c582ea87 100644
--- a/libpthread/linuxthreads/mutex.c
+++ b/libpthread/linuxthreads/mutex.c
@@ -16,6 +16,8 @@
/* Mutexes */
+#include <features.h>
+#define __USE_GNU
#include <errno.h>
#include <sched.h>
#include <stddef.h>